-9-8b^2=-129

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Solution for -9-8b^2=-129 equation: 


Simplifying
-9 + -8b2 = -129

Solving
-9 + -8b2 = -129

Solving for variable 'b'.

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

Add '9' to each side of the equation.
-9 + 9 + -8b2 = -129 + 9

Combine like terms: -9 + 9 = 0
0 + -8b2 = -129 + 9
-8b2 = -129 + 9

Combine like terms: -129 + 9 = -120
-8b2 = -120

Divide each side by '-8'.
b2 = 15

Simplifying
b2 = 15

Take the square root of each side:
b = {-3.872983346, 3.872983346}

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