# Chapter 11 - Quadratic Functions and Equations - 11.3 Studying Solutions of Quadratic Equations - 11.3 Exercise Set - Page 718: 29

$x^{2}+x-20=0$

#### Work Step by Step

$x=-5$ or $x=4\qquad$....get $0$'s on one side. $x+5=0$ or $x-4=0\qquad$....Use the principle of zero products (multiplying). The solutions of this equation are $-5$ and $4$. $(x+5)(x-4)=0\qquad$...use the FOIL method to multiply. $x^{2}-4x+5x-20=0\qquad$...combine like terms. $x^{2}+x-20=0$

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