00.9=f^2

Solution for 00.9=f^2 equation:

Simplifying
0.9 = f2

Solving
0.9 = f2

Solving for variable 'f'.

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

Add '-1f2' to each side of the equation.
0.9 + -1f2 = f2 + -1f2

Combine like terms: f2 + -1f2 = 0
0.9 + -1f2 = 0

Add '-0.9' to each side of the equation.
0.9 + -0.9 + -1f2 = 0 + -0.9

Combine like terms: 0.9 + -0.9 = 0.0
0.0 + -1f2 = 0 + -0.9
-1f2 = 0 + -0.9

Combine like terms: 0 + -0.9 = -0.9
-1f2 = -0.9

Divide each side by '-1'.
f2 = 0.9

Simplifying
f2 = 0.9

Take the square root of each side:
f = {-0.948683298, 0.948683298}