x^2-22+21=0

Solution for x^2-22+21=0 equation:

Simplifying
x2 + -22 + 21 = 0

Reorder the terms:
-22 + 21 + x2 = 0

Combine like terms: -22 + 21 = -1
-1 + x2 = 0

Solving
-1 + x2 = 0

Solving for variable 'x'.

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

Add '1' to each side of the equation.
-1 + 1 + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + x2 = 0 + 1
x2 = 0 + 1

Combine like terms: 0 + 1 = 1
x2 = 1

Simplifying
x2 = 1

Take the square root of each side:
x = {-1, 1}