4f^2=81

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Solution for 4f^2=81 equation: 


Simplifying
4f2 = 81

Solving
4f2 = 81

Solving for variable 'f'.

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

Divide each side by '4'.
f2 = 20.25

Simplifying
f2 = 20.25

Take the square root of each side:
f = {-4.5, 4.5}

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