3x^2-45-12=0

Solution for 3x^2-45-12=0 equation:

Simplifying
3x2 + -45 + -12 = 0

Reorder the terms:
-45 + -12 + 3x2 = 0

Combine like terms: -45 + -12 = -57
-57 + 3x2 = 0

Solving
-57 + 3x2 = 0

Solving for variable 'x'.

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

Add '57' to each side of the equation.
-57 + 57 + 3x2 = 0 + 57

Combine like terms: -57 + 57 = 0
0 + 3x2 = 0 + 57
3x2 = 0 + 57

Combine like terms: 0 + 57 = 57
3x2 = 57

Divide each side by '3'.
x2 = 19

Simplifying
x2 = 19

Take the square root of each side:
x = {-4.358898944, 4.358898944}