Math Word Problems Demystified - A Self Teaching Guide

60 xþ 960 ¼x^2 þ 32 x

60 x
 60 xþ 960 ¼x^2 þ 32 x
 60 x

960 ¼x^2 
 28 x

960 
 960 ¼x^2 
 28 xþ 960

0 ¼x^2 
 28 xþ 960

0 ¼ðx
 48 Þðxþ 20 Þ

ðx
 48 Þ¼ 0 xþ 20 ¼ 0

x
 48 þ 48 ¼ 0 þ 48 xþ 20 
 20 ¼ 0 
 20

x¼ 48 x¼
 20

It will take 48 minutes. Ignorex¼
20 since it is meaningless.

LESSON 19 Using Quadratic Equations 239