# Chapter 9 - Quadratic Functions and Equations - 9-4 Factoring to Solve Quadratic Equations - Practice and Problem-Solving Exercises - Page 571: 25

$b = \pm \frac{4}{3}$

#### Work Step by Step

$9b^2=16$ $9b^2-16=0$ $(3b)^2-4^2=0$ $(3b-4)(3b+4)=0$ $3b-4=0$ or $3b+4=0$ $b = \pm \frac{4}{3}$

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