5*20=x*x

Solution for 5*20=x*x equation:

Simplifying
5 * 20 = x * x

Multiply 5 * 20
100 = x * x

Multiply x * x
100 = x2

Solving
100 = x2

Solving for variable 'x'.

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

Add '-1x2' to each side of the equation.
100 + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
100 + -1x2 = 0

Add '-100' to each side of the equation.
100 + -100 + -1x2 = 0 + -100

Combine like terms: 100 + -100 = 0
0 + -1x2 = 0 + -100
-1x2 = 0 + -100

Combine like terms: 0 + -100 = -100
-1x2 = -100

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

Simplifying
x2 = 100

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