Maths-
General
Easy

Question

f left parenthesis x right parenthesis equals x cubed minus 9 x
g left parenthesis x right parenthesis equals x squared minus 2 x minus 3
Which of the following expressions is equivalent to fraction numerator f left parenthesis x right parenthesis over denominator g left parenthesis x right parenthesis end fraction, for x > 3 ?

  1. fraction numerator 1 over denominator x plus 1 end fraction
  2. fraction numerator x plus 3 over denominator x plus 1 end fraction
  3. fraction numerator x left parenthesis x minus 3 right parenthesis over denominator x plus 1 end fraction
  4. fraction numerator x left parenthesis x plus 3 right parenthesis over denominator x plus 1 end fraction

hintHint:

We know that left parenthesis a minus b right parenthesis squared equals left parenthesis a plus b right parenthesis left parenthesis a minus b right parenthesis. We use this formula and perform some algebraic manipulations to solve the problem.

The correct answer is: fraction numerator x left parenthesis x plus 3 right parenthesis over denominator x plus 1 end fraction


    Step 1 of 2:
    Given, f left parenthesis x right parenthesis equals x cubed minus 9 x

    not stretchy rightwards double arrow f left parenthesis x right parenthesis equals x open parentheses x squared minus 9 close parentheses
    not stretchy rightwards double arrow f left parenthesis x right parenthesis equals x open parentheses x squared minus 3 squared close parentheses equals x left parenthesis x plus 3 right parenthesis left parenthesis x minus 3 right parenthesis
    And g left parenthesis x right parenthesis equals x squared minus 2 x minus 3
    table attributes columnalign right left right left right left right left right left right left columnspacing 0em 2em 0em 2em 0em 2em 0em 2em 0em 2em 0em end attributes row cell not stretchy rightwards double arrow g left parenthesis x right parenthesis equals x squared minus left parenthesis 3 minus 1 right parenthesis x minus 3 end cell row cell not stretchy rightwards double arrow g left parenthesis x right parenthesis equals x squared minus 3 x plus x minus 3 end cell row cell not stretchy rightwards double arrow g left parenthesis x right parenthesis equals x left parenthesis x minus 3 right parenthesis plus left parenthesis x minus 3 right parenthesis end cell end table
    Step 2 of 2:
    Now, fraction numerator f left parenthesis x right parenthesis over denominator g left parenthesis x right parenthesis end fraction equals fraction numerator x left parenthesis x plus 3 right parenthesis left parenthesis x minus 3 right parenthesis over denominator left parenthesis x minus 3 right parenthesis left parenthesis x plus 1 right parenthesis end fraction
    not stretchy rightwards double arrow fraction numerator f left parenthesis x right parenthesis over denominator g left parenthesis x right parenthesis end fraction equals fraction numerator x left parenthesis x plus 3 right parenthesis over denominator x plus 1 end fraction, by cancelling out the term (x - 3) for x > 3
    Final Answer:
    The expression equivalent to fraction numerator f left parenthesis x right parenthesis over denominator g left parenthesis x right parenthesis end fraction, for x > 3, is— D) fraction numerator x left parenthesis x plus 3 right parenthesis over denominator x plus 1 end fraction.

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