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Simplifying
84 + -4b2 = 0
Solving
84 + -4b2 = 0
Solving for variable 'b'.
Move all terms containing b to the left, all other terms to the right.
Add '-84' to each side of the equation.
84 + -84 + -4b2 = 0 + -84
Combine like terms: 84 + -84 = 0
0 + -4b2 = 0 + -84
-4b2 = 0 + -84
Combine like terms: 0 + -84 = -84
-4b2 = -84
Divide each side by '-4'.
b2 = 21
Simplifying
b2 = 21
Take the square root of each side:
b = {-4.582575695, 4.582575695}
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