9-7x^2=-166

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Solution for 9-7x^2=-166 equation: 


Simplifying
9 + -7x2 = -166

Solving
9 + -7x2 = -166

Solving for variable 'x'.

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

Add '-9' to each side of the equation.
9 + -9 + -7x2 = -166 + -9

Combine like terms: 9 + -9 = 0
0 + -7x2 = -166 + -9
-7x2 = -166 + -9

Combine like terms: -166 + -9 = -175
-7x2 = -175

Divide each side by '-7'.
x2 = 25

Simplifying
x2 = 25

Take the square root of each side:
x = {-5, 5}

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