Maths-
General
Easy

Question

Find the product and the domain ?
fraction numerator left parenthesis straight x minus straight y right parenthesis squared over denominator straight x plus straight y end fraction cross times fraction numerator 3 straight x plus 3 straight y over denominator straight x squared minus straight y squared end fraction
 

hintHint:

The expansion of the identity,open parentheses straight x squared minus straight a squared close parentheses equals left parenthesis straight x minus straight a right parenthesis left parenthesis straight x plus straight a right parenthesis. We have to state the domain of a rational expression while simplifying them because we must exclude zeros of a denominator as dividing with zero is not defined.
We are asked to simplify the expression and give its domain.

The correct answer is: the domain of the expression set of real values minus the additive inverse of x.


    Step 1 of 2:
    Simplify the expression and cancel out the common factors;
    table attributes columnalign right columnspacing 0em end attributes row cell fraction numerator left parenthesis straight x minus straight y right parenthesis squared over denominator straight x plus straight y end fraction cross times fraction numerator 3 straight x plus 3 straight y over denominator straight x squared minus straight y squared end fraction equals fraction numerator left parenthesis straight x minus straight y right parenthesis left parenthesis straight x minus straight y right parenthesis over denominator straight x plus straight y end fraction cross times fraction numerator 3 left parenthesis straight x plus straight y right parenthesis over denominator left parenthesis straight x minus straight y right parenthesis left parenthesis straight x plus straight y right parenthesis end fraction end cell row cell equals fraction numerator 3 left parenthesis straight x minus straight y right parenthesis over denominator left parenthesis straight x plus straight y 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 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 end cell end table
    Thus, the simplified expression is fraction numerator 3 left parenthesis straight x minus straight y right parenthesis over denominator left parenthesis straight x plus straight y right parenthesis end fraction
    Step 2 of 2:
    The domain of a rational expression should exclude the values for which the denominator attains a zero values. So, when
    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 x plus y equals 0 end cell row cell x equals negative y space space end cell end table
    Here, both x and y are variables. To avoid getting a zero in the denominator y should not take the negative value of x. That is, it should not be the additive inverse of x.
    So, the domain of the expression set of real values minus the additive inverse of x.

    Additive inverse of a value x is the value y for which x + y = 0.

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