Maths-
General
Easy

Question

Write an equivalent expression , state the domain .
fraction numerator x cubed plus 4 x squared minus 12 x over denominator x squared plus x minus 30 end fraction

hintHint:

The expansion of  left parenthesis straight x plus straight a right parenthesis left parenthesis straight x plus straight b right parenthesis text  is  end text straight x squared plus left parenthesis straight a plus straight b right parenthesis straight x plus ab. 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 find an equivalent expression and domain for the given expression.

The correct answer is: Hence, the domain is, (-∞,5)∪(5,∞).


    Step 1 of 2:
    Simplify the expression and cancel out the common terms.
    fraction numerator straight x cubed plus 4 straight x squared minus 12 straight x over denominator straight x squared plus straight x minus 30 end fraction equals fraction numerator straight x open parentheses straight x squared plus 4 straight x minus 12 close parentheses over denominator straight x squared plus straight x minus 30 end fraction
    equals fraction numerator x open parentheses x squared plus 6 x minus 2 x minus 12 close parentheses over denominator x squared plus 6 x minus 5 x minus 30 end fraction
    equals fraction numerator straight x left parenthesis straight x left parenthesis straight x plus 6 right parenthesis minus 2 left parenthesis straight x plus 6 right parenthesis right parenthesis over denominator straight x left parenthesis straight x plus 6 right parenthesis minus 5 left parenthesis straight x plus 6 right parenthesis end fraction
    equals fraction numerator straight x left parenthesis straight x minus 2 right parenthesis left parenthesis straight x plus 6 right parenthesis over denominator left parenthesis straight x minus 5 right parenthesis left parenthesis straight x plus 6 right parenthesis end fraction
    equals fraction numerator straight x left parenthesis straight x minus 2 right parenthesis over denominator straight x minus 5 end fraction
    Hence, an equivalent expression for  fraction numerator straight x cubed plus 4 straight x squared minus 12 straight x over denominator straight x squared plus straight x minus 30 end fraction text  would be,  end text fraction numerator straight x left parenthesis straight x minus 2 right parenthesis over denominator straight x minus 5 end fraction.
    Step 2 of 2:
    When we find the domain, we have to exclude the values for which the denominator attains a zero value. So, we have:
    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 minus 5 equals 0 end cell row cell x equals 5 space space space space space space end cell end table
    That is,  x = 5 must be excluded.
    Hence, the domain is,left parenthesis negative infinity comma 5 right parenthesis union left parenthesis 5 comma infinity 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.

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