## Algebra 1

Published by Prentice Hall

# Chapter 9 - Quadratic Functions and Equations - 9-6 The Quadratic Formula and the Discriminant - Practice and Problem-Solving Exercises - Page 573: 46

#### 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) $-b/a = -8+x$ $-3/2 = -8 +x$ $-1.5 = -8+x$ $-1.5+8 =-8+x+8$ $6.5 = x$

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