Answer
$m=8$ or $m=\frac{-5}{4}$
Work Step by Step
$4m^2-27m-40=0$
$(m-8)(4m+5)=0$
$m-8=0$ or $4m+5=0$
$m=8$ or $m=\frac{-5}{4}$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 9 - Quadratic Functions and Equations - 9-4 Factoring to Solve Quadratic Equations - Practice and Problem-Solving Exercises - Page 571: 19
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