How do you solve using the completing the square method x^2-12x+20=0?
1 Answer
May 29, 2018
Explanation:
"subtract 20 from both sides"
x^2-12x=-20
• " add "(1/2"coefficient of the x-term")^2" to both sides"
x^2+2(-6)x color(red)(+36)=-20color(red)(+36)
(x-6)^2=16
color(blue)"take the square root of both sides"
sqrt((x-6)^2)=+-sqrt16larrcolor(blue)"note plus or minus"
x-6=+-4
"add 6 to both sides"
x=6+-4
x=6-4=2" or "x=6+4=10