Question

Which of the following is equal to the rational expression when x=-1 or -7? (x+1)(x-1)/(x+7)(x+1) a. x+7/x-1 b. x-1/x+7 c. x+1/x+7

Answer 1

Answer:b

Explanation:

(×+1)(×-1)

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(×+1)(×+7)

=cancel (×+1) both the numerator and denominator then you are left with

(×-1)

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(×+7)

=(×-1)/(×+7)