# Chapter 6 - Section 6.6 - Solving Quadratic Equations by Factoring - Exercise Set: 15

x=-8 or -1

#### Work Step by Step

Rewrite the equation in standard form. x$^2$+9x=-8 x$^2$+9x+8=0 Factor the trinomial. (x+8)(x+1)=0 Set each variable factor as equal to zero and then isolate the variable to find the solutions. x+8=0 or x+1=0 x=-8 or x=-1 Enter the original equation into your graphing utility to observe that the graph crosses the x-axis at -8 and -1.

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