20-x^2=9

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Solution for 20-x^2=9 equation: 


Simplifying
20 + -1x2 = 9

Solving
20 + -1x2 = 9

Solving for variable 'x'.

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

Add '-20' to each side of the equation.
20 + -20 + -1x2 = 9 + -20

Combine like terms: 20 + -20 = 0
0 + -1x2 = 9 + -20
-1x2 = 9 + -20

Combine like terms: 9 + -20 = -11
-1x2 = -11

Divide each side by '-1'.
x2 = 11

Simplifying
x2 = 11

Take the square root of each side:
x = {-3.31662479, 3.31662479}

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