-320=-45f^2

Solution for -320=-45f^2 equation:

Simplifying
-320 = -45f2

Solving
-320 = -45f2

Solving for variable 'f'.

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

Add '45f2' to each side of the equation.
-320 + 45f2 = -45f2 + 45f2

Combine like terms: -45f2 + 45f2 = 0
-320 + 45f2 = 0

Add '320' to each side of the equation.
-320 + 320 + 45f2 = 0 + 320

Combine like terms: -320 + 320 = 0
0 + 45f2 = 0 + 320
45f2 = 0 + 320

Combine like terms: 0 + 320 = 320
45f2 = 320

Divide each side by '45'.
f2 = 7.111111111

Simplifying
f2 = 7.111111111

Take the square root of each side:
f = {-2.666666667, 2.666666667}