f^2-19=-1

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Solution for f^2-19=-1 equation: 


Simplifying
f2 + -19 = -1

Reorder the terms:
-19 + f2 = -1

Solving
-19 + f2 = -1

Solving for variable 'f'.

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

Add '19' to each side of the equation.
-19 + 19 + f2 = -1 + 19

Combine like terms: -19 + 19 = 0
0 + f2 = -1 + 19
f2 = -1 + 19

Combine like terms: -1 + 19 = 18
f2 = 18

Simplifying
f2 = 18

Take the square root of each side:
f = {-4.242640687, 4.242640687}

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