81v^2-100f^2=

Solution for 81v^2-100f^2= equation:

Simplifying
81v2 + -100f2 = 0

Reorder the terms:
-100f2 + 81v2 = 0

Solving
-100f2 + 81v2 = 0

Solving for variable 'f'.

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

Add '-81v2' to each side of the equation.
-100f2 + 81v2 + -81v2 = 0 + -81v2

Combine like terms: 81v2 + -81v2 = 0
-100f2 + 0 = 0 + -81v2
-100f2 = 0 + -81v2
Remove the zero:
-100f2 = -81v2

Divide each side by '-100'.
f2 = 0.81v2

Simplifying
f2 = 0.81v2

Take the square root of each side:
f = {-0.9v, 0.9v}