SOLUTION: f(x) = x^2 + 4x - 12 Solve by completing the square.

Question 1025366: f(x) = x^2 + 4x - 12 Solve by completing the square.
Found 2 solutions by josgarithmetic, ankor@dixie-net.com:
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
Add and Subtract 4 to the right hand member. Do you know why 4?

What is the meaning of Completing the Square?

Using Complete-The-Square to solve a Quadratic Equation

RESULT:
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
f(x) = x^2 + 4x - 12 Solve by completing the square.
:
x^2 + 4x + __ = 12
Complete the square, divide the coefficient of x by 2 and square it (4/2)^2
add to both sides
x^2 + 4x + 4 = 12 + 4
x^2 + 4x + 4 = 16
A perfect square which is:
(x+2)^2 = 16
Find the square root of both side
x + 2 = +/-
x + 2 = +/- 4
Subtract 2 from both sides, two solutions
x = -2 + 4
x = 2
and
x = -2 - 4
x = -6
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