w^2-81f^2=

Solution for w^2-81f^2= equation:

Simplifying
w2 + -81f2 = 0

Reorder the terms:
-81f2 + w2 = 0

Solving
-81f2 + w2 = 0

Solving for variable 'f'.

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

Add '-1w2' to each side of the equation.
-81f2 + w2 + -1w2 = 0 + -1w2

Combine like terms: w2 + -1w2 = 0
-81f2 + 0 = 0 + -1w2
-81f2 = 0 + -1w2
Remove the zero:
-81f2 = -1w2

Divide each side by '-81'.
f2 = 0.01234567901w2

Simplifying
f2 = 0.01234567901w2

Take the square root of each side:
f = {-0.111111111w, 0.111111111w}