100+x*x=400

Solution for 100+x*x=400 equation:

Simplifying
100 + x * x = 400

Multiply x * x
100 + x2 = 400

Solving
100 + x2 = 400

Solving for variable 'x'.

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

Add '-100' to each side of the equation.
100 + -100 + x2 = 400 + -100

Combine like terms: 100 + -100 = 0
0 + x2 = 400 + -100
x2 = 400 + -100

Combine like terms: 400 + -100 = 300
x2 = 300

Simplifying
x2 = 300

Take the square root of each side:
x = {-17.320508076, 17.320508076}