Answer
$$(4x-1)(x+4).$$
Work Step by Step
For the polynomial
$$
4x^2 + 15x - 4
$$
we check the factors of $ac=-4(4)=-16$. The only factors that can give the right middle term are $-4$ and $4$, as follows
$$4x^2 + 15x - 4 =(4x-1)(x+4).$$
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: 8
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