9-12+4x^2=0

Solution for 9-12+4x^2=0 equation:

Simplifying
9 + -12 + 4x2 = 0

Combine like terms: 9 + -12 = -3
-3 + 4x2 = 0

Solving
-3 + 4x2 = 0

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '3' to each side of the equation.
-3 + 3 + 4x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 4x2 = 0 + 3
4x2 = 0 + 3

Combine like terms: 0 + 3 = 3
4x2 = 3

Divide each side by '4'.
x2 = 0.75

Simplifying
x2 = 0.75

Take the square root of each side:
x = {-0.866025404, 0.866025404}