21+66+9x^2=0

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Solution for 21+66+9x^2=0 equation:


Simplifying
21 + 66 + 9x2 = 0

Combine like terms: 21 + 66 = 87
87 + 9x2 = 0

Solving
87 + 9x2 = 0

Solving for variable 'x'.

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

Add '-87' to each side of the equation.
87 + -87 + 9x2 = 0 + -87

Combine like terms: 87 + -87 = 0
0 + 9x2 = 0 + -87
9x2 = 0 + -87

Combine like terms: 0 + -87 = -87
9x2 = -87

Divide each side by '9'.
x2 = -9.666666667

Simplifying
x2 = -9.666666667

Reorder the terms:
9.666666667 + x2 = -9.666666667 + 9.666666667

Combine like terms: -9.666666667 + 9.666666667 = 0.000000000
9.666666667 + x2 = 0.000000000

The solution to this equation could not be determined.

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