f(0)=-x^2+81

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Solution for f(0)=-x^2+81 equation: 


Simplifying
f(0) = -1x2 + 81

Reorder the terms for easier multiplication:
0f = -1x2 + 81

Anything times zero is zero.
0f = -1x2 + 81

Reorder the terms:
0 = 81 + -1x2

Solving
0 = 81 + -1x2

Solving for variable 'x'.

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

Add 'x2' to each side of the equation.
0 + x2 = 81 + -1x2 + x2
Remove the zero:
x2 = 81 + -1x2 + x2

Combine like terms: -1x2 + x2 = 0
x2 = 81 + 0
x2 = 81

Simplifying
x2 = 81

Take the square root of each side:
x = {-9, 9}

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