x^2+2-21=0

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

Simplifying
x2 + 2 + -21 = 0

Reorder the terms:
2 + -21 + x2 = 0

Combine like terms: 2 + -21 = -19
-19 + x2 = 0

Solving
-19 + x2 = 0

Solving for variable 'x'.

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

Add '19' to each side of the equation.
-19 + 19 + x2 = 0 + 19

Combine like terms: -19 + 19 = 0
0 + x2 = 0 + 19
x2 = 0 + 19

Combine like terms: 0 + 19 = 19
x2 = 19

Simplifying
x2 = 19

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