how do i complete the square?
x^2 - 4x - 9 =
x^2 - 4x + (4/2)^2 - 9 - (4/2)^2
(x - 4/2)^2 - 9 - (4/2)^2 =
(x - 2)^2 - 13
x^2 â 4x â 9
= x^2 - 2 * 2* x + 4 - 9 - 4
= (x - 2)^2 - 13
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Verified answer
x^2 - 4x - 9 =
x^2 - 4x + (4/2)^2 - 9 - (4/2)^2
(x - 4/2)^2 - 9 - (4/2)^2 =
(x - 2)^2 - 13
x^2 â 4x â 9
= x^2 - 2 * 2* x + 4 - 9 - 4
= (x - 2)^2 - 13