Friday
April 18, 2014

Homework Help: Algebra

Posted by John on Tuesday, November 13, 2007 at 5:57pm.

I got a couple I want to check my work :
Both are Solve using the quadratic formula :
1) x^2-3x=7x-2
x^2-3x-7x+2=7x-7x-2+2
x^2-10x+2=0
x = 10 +- sqrt10^2 - 4(1)(2) / 2(1)
x = 10 +- sqrt100 - 8 / 2
x = 10 +- sqrt92 / 2
x = 10 +- 2sqrt23 /2
x = 5 +- sqrt23
x = 5 + sqrt23 and x = 5 - sqrt23

2) x^2-7x-1= -7
x^2-7x+7-1 = -7+7
x^2-7x+6 = 0
x = 7 +- sqrt7^2 - 4(1)(6) / 2(1)
x = 7 +- sqrt49-24 / 2
x = 7 +- sqrt25 / 2
x = 7 +- 5 / 2
x = 7+5 / 2 , x = 12 / 2 , x = 6
x = 7-5 / 2 , x = 2 / 2 , x = 1

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