640=18x^2

Solution for 640=18x^2 equation:

Simplifying
640 = 18x2

Solving
640 = 18x2

Solving for variable 'x'.

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

Add '-18x2' to each side of the equation.
640 + -18x2 = 18x2 + -18x2

Combine like terms: 18x2 + -18x2 = 0
640 + -18x2 = 0

Add '-640' to each side of the equation.
640 + -640 + -18x2 = 0 + -640

Combine like terms: 640 + -640 = 0
0 + -18x2 = 0 + -640
-18x2 = 0 + -640

Combine like terms: 0 + -640 = -640
-18x2 = -640

Divide each side by '-18'.
x2 = 35.55555556

Simplifying
x2 = 35.55555556

Take the square root of each side:
x = {-5.96284794, 5.96284794}