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Simplifying
x2 + 13 = 20
Reorder the terms:
13 + x2 = 20
Solving
13 + x2 = 20
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-13' to each side of the equation.
13 + -13 + x2 = 20 + -13
Combine like terms: 13 + -13 = 0
0 + x2 = 20 + -13
x2 = 20 + -13
Combine like terms: 20 + -13 = 7
x2 = 7
Simplifying
x2 = 7
Take the square root of each side:
x = {-2.645751311, 2.645751311}