x^2-42-400=

Solution for x^2-42-400= equation:

Simplifying
x2 + -42 + -400 = 0

Reorder the terms:
-42 + -400 + x2 = 0

Combine like terms: -42 + -400 = -442
-442 + x2 = 0

Solving
-442 + x2 = 0

Solving for variable 'x'.

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

Add '442' to each side of the equation.
-442 + 442 + x2 = 0 + 442

Combine like terms: -442 + 442 = 0
0 + x2 = 0 + 442
x2 = 0 + 442

Combine like terms: 0 + 442 = 442
x2 = 442

Simplifying
x2 = 442

Take the square root of each side:
x = {-21.023796042, 21.023796042}