400-x^2=300

Solution for 400-x^2=300 equation:

Simplifying
400 + -1x2 = 300

Solving
400 + -1x2 = 300

Solving for variable 'x'.

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

Add '-400' to each side of the equation.
400 + -400 + -1x2 = 300 + -400

Combine like terms: 400 + -400 = 0
0 + -1x2 = 300 + -400
-1x2 = 300 + -400

Combine like terms: 300 + -400 = -100
-1x2 = -100

Divide each side by '-1'.
x2 = 100

Simplifying
x2 = 100

Take the square root of each side:
x = {-10, 10}