Answer
$(3x-7)(x+9)$
Work Step by Step
For the polynomial
$$
3x^2 +20x -63
$$
we check the factors of $ac=3(-63)=-189$. The only factors that can give the right middle term are $-7$ and $27$, as follows
$$
3x^2 +20x -63 =(3x-7)(x+9)
.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 10 - Section 10.6 - Factoring General Trinomials - Exercise - Page 356: 21
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