Answer
a) $-b/a$
b) 6.5
Work Step by Step
a)
$(-b+\sqrt {b^2-4ac})/2a + (-b-\sqrt {b^2-4ac})/2a)$
$(-b+\sqrt {b^2-4ac}+(-b-\sqrt {b^2-4ac}))/2a$
$-2b/2a$
$-b/a$
b)
$-b/a = -8+x$
$-3/2 = -8 +x$
$-1.5 = -8+x$
$-1.5+8 =-8+x+8$
$6.5 = x$
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 - 9-6 The Quadratic Formula and the Discriminant - Practice and Problem-Solving Exercises - Page 573: 46
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