-400=-100x^2

Solution for -400=-100x^2 equation:

Simplifying
-400 = -100x2

Solving
-400 = -100x2

Solving for variable 'x'.

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

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

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

Add '400' to each side of the equation.
-400 + 400 + 100x2 = 0 + 400

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

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

Divide each side by '100'.
x2 = 4

Simplifying
x2 = 4

Take the square root of each side:
x = {-2, 2}