Question

Factor the trinomial below.

x2 + 4x – 21

A. (x – 3)(x + 7)
B. (x + 3)(x – 7)
C. (x + 3)(x + 7)
D. (x – 3)(x – 7)

Answer 1

the answer is A. (X-3)(x+7)

Answer 2

Answer: (x + 7)(x - 3)


Explanation:

x² + 4x – 21 = (x + 7)(x - 3)


x \     /   7         7x
     \ /
    /  \
x/      \   -3       -3x
---------------------------
x²         -21      +4x
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