Question

Solve x2 – 4x = 12 by completing the square. Show your work for full credit.

Answer 1

first you divide coefficient of -4x by 2 giving -2
and now you write
(x - 2)^2 - (-2)^2 = 12
(x - 2)^2 - 4 = 12
(x - 2)^2 = 16
take square roots of both sides
x - 2 = +/- 4

x = 4 +2 or -4 + 2

so the solution set is {6 , -2}

Answer 2

thankyou!

Answer 3

yw