3x^2-54=-21

Solution for 3x^2-54=-21 equation:

Simplifying
3x2 + -54 = -21

Reorder the terms:
-54 + 3x2 = -21

Solving
-54 + 3x2 = -21

Solving for variable 'x'.

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

Add '54' to each side of the equation.
-54 + 54 + 3x2 = -21 + 54

Combine like terms: -54 + 54 = 0
0 + 3x2 = -21 + 54
3x2 = -21 + 54

Combine like terms: -21 + 54 = 33
3x2 = 33

Divide each side by '3'.
x2 = 11

Simplifying
x2 = 11

Take the square root of each side:
x = {-3.31662479, 3.31662479}