408=40x^2

Solution for 408=40x^2 equation:

Simplifying
408 = 40x2

Solving
408 = 40x2

Solving for variable 'x'.

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

Add '-40x2' to each side of the equation.
408 + -40x2 = 40x2 + -40x2

Combine like terms: 40x2 + -40x2 = 0
408 + -40x2 = 0

Add '-408' to each side of the equation.
408 + -408 + -40x2 = 0 + -408

Combine like terms: 408 + -408 = 0
0 + -40x2 = 0 + -408
-40x2 = 0 + -408

Combine like terms: 0 + -408 = -408
-40x2 = -408

Divide each side by '-40'.
x2 = 10.2

Simplifying
x2 = 10.2

Take the square root of each side:
x = {-3.193743885, 3.193743885}