Answer
$z=-1.5, 12$
Work Step by Step
$2z^2-21z-36=0$
$2z^2-24z+3z-36=0$
$2z(z-12)+3(z-12)=0$
$(2z+3)(z-12) = 0$
$2z+3 = 0$
$2z+3-3 =0-3$
$2z = -3$
$2z/2 = -3/2$
$z = -1.5$
$z-12 = 0$
$z-12+12 = 0+12$
$z = 12$
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 9 - Quadratic Functions and Equations - 9-4 Factoring to Solve Quadratic Equations - Practice and Problem-Solving Exercises - Page 558: 17
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