x^2+21-54=0

Solution for x^2+21-54=0 equation:

Simplifying
x2 + 21 + -54 = 0

Reorder the terms:
21 + -54 + x2 = 0

Combine like terms: 21 + -54 = -33
-33 + x2 = 0

Solving
-33 + x2 = 0

Solving for variable 'x'.

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

Add '33' to each side of the equation.
-33 + 33 + x2 = 0 + 33

Combine like terms: -33 + 33 = 0
0 + x2 = 0 + 33
x2 = 0 + 33

Combine like terms: 0 + 33 = 33
x2 = 33

Simplifying
x2 = 33

Take the square root of each side:
x = {-5.744562647, 5.744562647}