70=0.8x^2

Solution for 70=0.8x^2 equation:

Simplifying
70 = 0.8x2

Solving
70 = 0.8x2

Solving for variable 'x'.

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

Add '-0.8x2' to each side of the equation.
70 + -0.8x2 = 0.8x2 + -0.8x2

Combine like terms: 0.8x2 + -0.8x2 = 0.0
70 + -0.8x2 = 0.0

Add '-70' to each side of the equation.
70 + -70 + -0.8x2 = 0.0 + -70

Combine like terms: 70 + -70 = 0
0 + -0.8x2 = 0.0 + -70
-0.8x2 = 0.0 + -70

Combine like terms: 0.0 + -70 = -70
-0.8x2 = -70

Divide each side by '-0.8'.
x2 = 87.5

Simplifying
x2 = 87.5

Take the square root of each side:
x = {-9.354143467, 9.354143467}