Can someone explain how to do this?

Question

asked Sep 1, 2018 96.2k views

1 Answer

Jurn · Answer 1 · 2018-09-05T13:24:25+0000

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

Can someone explain how to do this?

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