# Chapter 10 - Radical Expressions and Equations - 10-3 Operations with Radial Expressions - Mixed Review - Page 618: 78

x=3 or x=-5

#### Work Step by Step

$x^2+2x-15=0\longrightarrow$ the factors of -15 that sum to 2 are -3,5 $(x-3)(x+5)=0$ Using the 0 product property, $x-3=0\ or\ x+5=0$ $x-3+3=0+3\ or\ x+5-5=0-5$ $x=3\ or\ x=-5$

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