Solve each of the quadratic equations for x by factoring. Write answers as exact values.
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Solve each of the quadratic equations for x by factoring. Write answers as exact values.

[From: ] [author: ] [Date: 11-05-10] [Hit: ]
.practice.......
a)2x^2+4x=30

b)2x^2-7x+5=0

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2x^2+4x=30
2x^2+4x-30=0
(2x+10)(x-3)=0

2x-10=0 x-3=0
2x=10 x=3
x=5

2x^2-7x+5=0

(2x-5)(x-1)=0

2x-5=0 x-1=0
2x=5 x=1
x=5/2

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b) 2x^2 - 7x + 5 = 0

2x^2 - 2x - 5x + 5 = 0

2x(x - 1) - 5(x - 1) = 0

(x - 1)(2x - 5) = 0

x = 1 or x = 5/2

check

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