3x^2-15=57

Solution for 3x^2-15=57 equation:

Simplifying
3x2 + -15 = 57

Reorder the terms:
-15 + 3x2 = 57

Solving
-15 + 3x2 = 57

Solving for variable 'x'.

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

Add '15' to each side of the equation.
-15 + 15 + 3x2 = 57 + 15

Combine like terms: -15 + 15 = 0
0 + 3x2 = 57 + 15
3x2 = 57 + 15

Combine like terms: 57 + 15 = 72
3x2 = 72

Divide each side by '3'.
x2 = 24

Simplifying
x2 = 24

Take the square root of each side:
x = {-4.898979486, 4.898979486}