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Can someone explain how to do this?

Can someone explain how to do this?-example-1
User Genu
by
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1 Answer

7 votes
x+7
------------------- =
x^2+4x -21

x+7
= -------------------
(x+7)(x-3)

1
= ---------- where x is not equal -7 and 3
x - 3

answer is A. first choice
User Jurn
by
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