Maths-
General
Easy

Question

Which of the following rational expressions simplify to fraction numerator y over denominator y plus 3 end fraction? Select all that apply .

  1. fraction numerator open parentheses 2 y squared plus y close parentheses left parenthesis y plus 3 right parenthesis over denominator left parenthesis 4 y plus 2 right parenthesis left parenthesis y plus 3 right parenthesis squared end fraction
  2. fraction numerator 2 y plus y squared over denominator 3 plus 4 y plus y squared end fraction
  3. fraction numerator y plus 3 y squared over denominator 3 plus 10 y plus 3 y squared end fraction

hintHint:

The expansion of the identity is  left parenthesis x plus a right parenthesis left parenthesis x plus b right parenthesis text  is  end text open parentheses x squared plus left parenthesis a plus b right parenthesis x plus a b close parentheses.
We are asked to simplify the expression and check which one of them are equivalent to fraction numerator y over denominator y space plus space 3 end fraction.

The correct answer is: fraction numerator y plus 3 y squared over denominator 3 plus 10 y plus 3 y squared end fraction


    Step 1 of 3:
    Simplify the expression, fraction numerator open parentheses 2 y squared plus y close parentheses left parenthesis y plus 3 right parenthesis over denominator left parenthesis 4 y plus 2 right parenthesis left parenthesis y plus 3 right parenthesis squared end fraction
    fraction numerator open parentheses 2 y squared plus y close parentheses left parenthesis y plus 3 right parenthesis over denominator left parenthesis 4 y plus 2 right parenthesis left parenthesis y plus 3 right parenthesis squared end fraction equals fraction numerator y left parenthesis 2 y plus 1 right parenthesis left parenthesis y plus 3 right parenthesis over denominator 2 left parenthesis 2 y plus 1 right parenthesis left parenthesis y plus 3 right parenthesis squared end fraction
    equals fraction numerator y over denominator 2 left parenthesis y plus 3 right parenthesis end fraction
    The simplified expression is not equal to fraction numerator y over denominator y space plus space 3 end fraction. Hence, they are not equivalent expressions.
    Step 2 of 3:
    Simplify the expression, fraction numerator 2 y plus y squared over denominator 3 plus 4 y plus y squared end fraction
    fraction numerator 2 y plus y squared over denominator 3 plus 4 y plus y squared end fraction equals fraction numerator y left parenthesis 2 plus y right parenthesis over denominator 3 plus 3 y plus y plus y squared end fraction
    equals fraction numerator y left parenthesis 2 plus y right parenthesis over denominator 3 left parenthesis 1 plus y right parenthesis plus y left parenthesis y plus 1 right parenthesis end fraction
    equals fraction numerator y left parenthesis 2 plus y right parenthesis over denominator left parenthesis 3 plus y right parenthesis left parenthesis y plus 1 right parenthesis end fraction
    equals fraction numerator left parenthesis 2 plus y right parenthesis over denominator left parenthesis 3 plus y right parenthesis left parenthesis y plus 1 right parenthesis end fraction
    The simplified expression is not equal to fraction numerator y over denominator y plus 3 end fraction. Hence, they are not equivalent expressions.
    Step 3 of 3:
    Simplify the expression, fraction numerator 2 y plus y squared over denominator 3 plus 4 y plus y squared end fraction
    fraction numerator y plus 3 y squared over denominator 3 plus 10 y plus 3 y squared end fraction equals fraction numerator y left parenthesis 1 plus 3 y right parenthesis over denominator 3 plus 9 y plus y plus 3 y squared end fraction
    equals fraction numerator y left parenthesis 1 plus 3 y right parenthesis over denominator 3 left parenthesis 1 plus 3 y right parenthesis plus y left parenthesis 1 plus 3 y right parenthesis end fraction
    equals fraction numerator y left parenthesis 1 plus 3 y right parenthesis over denominator left parenthesis 3 plus y right parenthesis left parenthesis 1 plus 3 y right parenthesis end fraction
    fraction numerator y over denominator 3 space plus space y end fraction
    The simplified expression is equal to fraction numerator y over denominator space y space plus space 3 end fraction. Hence, they are equivalent expressions.

    Simplify means to make it simple. In mathematics, simplify is the reduction of an expression/fraction into irreducible forms.

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