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April 21, 2014

Homework Help: Pre-Calc-Please check my answer

Posted by Sheila on Tuesday, September 6, 2011 at 8:12pm.

Please help-I'm stuck really bad
Thank you for any help you can provide


What are the roots of the equation x^2 -4x + 3 = 0
x^2 - 4x = 3
x^2 +2(-2)x + -2^2 = -3 = -2^2
x^2 + -4x + 4 = 1
(x + -2)^2 = 1
qrt (x+-2)^2 = sqrt 1
x+-2 = plus or minus 1
therefore x=1
x=3 roots are 1 and 3

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