Answer
$(4x-5)(x+3)$
Work Step by Step
For the polynomial
$$
4x^2 +7x -15
$$
we check the factors of $ac=4(-15)=-60$. The only factors that can give the right middle term are $-5$ and $12$, as follows
$$
4x^2 +7x -15 =(4x-5)(x+3)
.$$
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: 22
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