Question

Find the roots of the quadratic equation x2 – 8x = 9 by completing the square. Show your work.

Answer 1

\[x^2-8x=9\]
\[x^2-8x+(8/2)^2=9(8/2)^2\]
\[x^2-8x+16=25\]
\[\sqrt{(x-4)^2}=\sqrt{25}\]
\[x-4=\pm5\]
x=1,x=-9

Answer 2

thankx

Answer 3

welcome :-)

Answer 4

very helpfull