Maths-
General
Easy

Question

Statement-I : If fraction numerator 3 x plus 4 over denominator left parenthesis x plus 1 right parenthesis squared left parenthesis x minus 1 right parenthesis end fraction equals fraction numerator A over denominator x minus 1 end fraction plus fraction numerator B over denominator x plus 1 end fraction plus fraction numerator C over denominator left parenthesis x plus 1 right parenthesis squared end fraction then A=7 over 4
Statement-II : If fraction numerator p x plus q over denominator left parenthesis 2 x minus 3 right parenthesis squared end fraction equals fraction numerator 1 over denominator 2 x minus 3 end fraction plus fraction numerator 3 over denominator left parenthesis 2 x minus 3 right parenthesis squared end fraction then p equals 2 comma q equals 3

Which of the above statements is true

  1. Only I is true
  2. Only II is true
  3. both I & II are true
  4. Neither I nor II true

hintHint:

In this question we will solve both the questions to know whether they are true or not. In both statements we will first solve the fractions in RHS. Then we will find the coefficients of x squared, x and constant term after that we will compare both sides to get the value of A,B,C and p and q.

The correct answer is: Only I is true


    Statement-I : If fraction numerator 3 x plus 4 over denominator left parenthesis x plus 1 right parenthesis squared left parenthesis x minus 1 right parenthesis end fraction equals fraction numerator A over denominator x minus 1 end fraction plus fraction numerator B over denominator x plus 1 end fraction plus fraction numerator C over denominator left parenthesis x plus 1 right parenthesis squared end fraction then A=7 over 4
    fraction numerator 3 x plus 4 over denominator left parenthesis x plus 1 right parenthesis squared left parenthesis x minus 1 right parenthesis end fraction equals fraction numerator A over denominator x minus 1 end fraction plus fraction numerator B over denominator x plus 1 end fraction plus fraction numerator C over denominator left parenthesis x plus 1 right parenthesis squared end fraction
space space space space space space space space space space space space space space space space space space space space space space space space space equals fraction numerator A left parenthesis x plus 1 right parenthesis squared plus B left parenthesis x minus 1 right parenthesis left parenthesis x plus 1 right parenthesis plus C left parenthesis x minus 1 right parenthesis over denominator left parenthesis x plus 1 right parenthesis squared left parenthesis x minus 1 right parenthesis end fraction
space space space space space space space space space space space space space space space space space space space space space space space space space equals fraction numerator A left parenthesis x squared plus 2 x plus 1 right parenthesis plus B left parenthesis x squared minus 1 right parenthesis plus C x minus C over denominator left parenthesis x plus 1 right parenthesis squared left parenthesis x minus 1 right parenthesis end fraction
space space space space space space space space space space space space space space space space space space space space space space space space space equals fraction numerator A x squared plus A 2 x plus A plus B x squared minus B plus C x minus C over denominator left parenthesis x plus 1 right parenthesis squared left parenthesis x minus 1 right parenthesis end fraction
space space space space space space space space space space space space space space space space space space space space space space space space space equals fraction numerator x squared left parenthesis A plus B right parenthesis plus x left parenthesis 2 A plus C right parenthesis plus 1 left parenthesis A minus B minus C right parenthesis over denominator left parenthesis x plus 1 right parenthesis squared left parenthesis x minus 1 right parenthesis end fraction
N o w comma space o n space c o m p a r i n g space b o t h space s i d e s space comma space
A plus B equals 0 comma space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space 2 A plus C equals 3 comma space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space A minus B minus C equals 4
rightwards double arrow A equals negative B space space space space space space space space space space space space space space space space space space space space space space space space space rightwards double arrow negative 2 B plus C equals 3 space space space space space space space space space space space space space space space space space space space space space space space space space rightwards double arrow negative B minus B minus C equals 4
p u t t i n g space B equals fraction numerator negative 7 over denominator 4 end fraction space space space space space space space space space space space space space space space space rightwards double arrow space minus 2 B equals 3 minus C space space space space space space space space space space space space space space space space space space space space space space space space rightwards double arrow negative 2 B minus C equals 4
rightwards double arrow A equals 7 over 4 space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space p u t t i n g C equals fraction numerator negative 1 over denominator 2 end fraction space space space space space space space space space space space space space space space space space space space rightwards double arrow space space space 3 minus C minus C equals 4
space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space rightwards double arrow negative 2 B equals 3 plus 1 half space space space space space space space space space space space space space space space space space space space space space space space rightwards double arrow space space space 3 minus 2 C equals 4
space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space rightwards double arrow B equals fraction numerator negative 7 over denominator 4 end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space rightwards double arrow space C equals fraction numerator negative 1 over denominator 2 end fraction space space space space space space space space
    statement 1 is true.
    Statement-II : If fraction numerator p x plus q over denominator left parenthesis 2 x minus 3 right parenthesis squared end fraction equals fraction numerator 1 over denominator 2 x minus 3 end fraction plus fraction numerator 3 over denominator left parenthesis 2 x minus 3 right parenthesis squared end fraction then p equals 2 comma q equals 3  
    fraction numerator p x plus q over denominator left parenthesis 2 x minus 3 right parenthesis squared end fraction equals fraction numerator 1 over denominator 2 x minus 3 end fraction plus fraction numerator 3 over denominator left parenthesis 2 x minus 3 right parenthesis squared end fraction
space space space space space space space space space space space space space space space space equals fraction numerator left parenthesis 2 x minus 3 right parenthesis plus 3 over denominator left parenthesis 2 x minus 3 right parenthesis squared end fraction
space space space space space space space space space space space space space space space space equals fraction numerator 2 x over denominator left parenthesis 2 x minus 3 right parenthesis squared end fraction
N o w comma space o n space c o m p a r i n g space b o t h space s i d e s space comma space
p equals 2 space a n d space q equals 0
    statement 2 is false.

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