6*6=f*f-13

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Solution for 6*6=f*f-13 equation: 


Simplifying
6 * 6 = f * f + -13

Multiply 6 * 6
36 = f * f + -13

Multiply f * f
36 = f2 + -13

Reorder the terms:
36 = -13 + f2

Solving
36 = -13 + f2

Solving for variable 'f'.

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

Add '-1f2' to each side of the equation.
36 + -1f2 = -13 + f2 + -1f2

Combine like terms: f2 + -1f2 = 0
36 + -1f2 = -13 + 0
36 + -1f2 = -13

Add '-36' to each side of the equation.
36 + -36 + -1f2 = -13 + -36

Combine like terms: 36 + -36 = 0
0 + -1f2 = -13 + -36
-1f2 = -13 + -36

Combine like terms: -13 + -36 = -49
-1f2 = -49

Divide each side by '-1'.
f2 = 49

Simplifying
f2 = 49

Take the square root of each side:
f = {-7, 7}

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