Maths-
General
Easy

Question

Find the Quotient and the domain .
fraction numerator left parenthesis straight x minus straight y right parenthesis squared over denominator straight x plus straight y end fraction divided by fraction numerator 3 straight x plus 3 straight y over denominator straight x squared minus straight y squared end fraction
 

hintHint:

The expansions of certain identities are:
table attributes columnalign right columnspacing 0em end attributes row cell left parenthesis straight x plus straight a right parenthesis left parenthesis straight x plus straight b right parenthesis equals straight x squared plus left parenthesis straight a plus straight b right parenthesis straight x plus ab end cell row cell 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 space space space space space space space space space space space space space space space end cell end table
Finding the quotient is same as division. Dividing a number and multiplying it with a reciprocal of the number have the same effect.
We are asked to find the quotient and the domain of the expression.

The correct answer is: the answer is given below


    Step 1 of 3:
    The given expression is fraction numerator left parenthesis straight x minus straight y right parenthesis squared over denominator straight x plus straight y end fraction divided by fraction numerator 3 straight x plus 3 straight y over denominator straight x squared minus straight y squared end fraction
    Take the reciprocal of the second expression and multiply;
    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 straight x squared minus straight y squared over denominator 3 straight x plus 3 straight y end fraction
    Step 2 of 3:
    Now, simplify the expression and cancel out the common terms;
    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 straight x squared minus straight y squared over denominator 3 straight x plus 3 straight y end fraction equals 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 left parenthesis straight x minus straight y right parenthesis left parenthesis straight x plus straight y right parenthesis over denominator 3 left parenthesis straight x plus straight y right parenthesis end fraction space end cell row cell equals fraction numerator left parenthesis straight x minus straight y right parenthesis squared over denominator 1 end fraction cross times fraction numerator left parenthesis straight x minus straight y right parenthesis over denominator 3 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 end cell row cell equals fraction numerator left parenthesis straight x minus straight y right parenthesis cubed over denominator 3 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 end cell end table
    Thus, the quotient is,fraction numerator left parenthesis x minus y right parenthesis cubed over denominator 3 left parenthesis x plus y right parenthesis end fraction
    Step 3 of 3:
    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 3 left parenthesis x plus y right parenthesis equals 0 space space space space space space end cell row cell x plus y equals 0 space space space space space space space space space space end cell row cell space x equals negative y space space space space space space space space space space space 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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    In this question, it can be explained further:
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    Here, Kimberly's free throws have the highest proportion.
    B. Martin: 49.5% > 9/20 > 0.448
    Here, Martin's proportion of field goals is the highest.
    C. Corey: 0.338 > 1/3 > 32%
    Kimberly > Corey > Martin
    From the above explanation, we can conclude Kimberly is first, Corey is second, and Martin is third.
    I'd go with Kimberly because he has a higher percentage on all shots than the other two players.

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