-7n^2-9n-9=0

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Solution for -7n^2-9n-9=0 equation: 


Simplifying
-7n2 + -9n + -9 = 0

Reorder the terms:
-9 + -9n + -7n2 = 0

Solving
-9 + -9n + -7n2 = 0

Solving for variable 'n'.

Factor out the Greatest Common Factor (GCF), '-1'.
-1(9 + 9n + 7n2) = 0

Ignore the factor -1.

Subproblem 1
Set the factor '(9 + 9n + 7n2)' equal to zero and attempt to solve:

Simplifying
9 + 9n + 7n2 = 0

Solving
9 + 9n + 7n2 = 0

Begin completing the square.  Divide all terms by
7 the coefficient of the squared term: 

Divide each side by '7'.
1.285714286 + 1.285714286n + n2 = 0

Move the constant term to the right:

Add '-1.285714286' to each side of the equation.
1.285714286 + 1.285714286n + -1.285714286 + n2 = 0 + -1.285714286

Reorder the terms:
1.285714286 + -1.285714286 + 1.285714286n + n2 = 0 + -1.285714286

Combine like terms: 1.285714286 + -1.285714286 = 0.000000000
0.000000000 + 1.285714286n + n2 = 0 + -1.285714286
1.285714286n + n2 = 0 + -1.285714286

Combine like terms: 0 + -1.285714286 = -1.285714286
1.285714286n + n2 = -1.285714286

The n term is 1.285714286n.  Take half its coefficient (0.642857143).
Square it (0.4132653063) and add it to both sides.

Add '0.4132653063' to each side of the equation.
1.285714286n + 0.4132653063 + n2 = -1.285714286 + 0.4132653063

Reorder the terms:
0.4132653063 + 1.285714286n + n2 = -1.285714286 + 0.4132653063

Combine like terms: -1.285714286 + 0.4132653063 = -0.8724489797
0.4132653063 + 1.285714286n + n2 = -0.8724489797

Factor a perfect square on the left side:
(n + 0.642857143)(n + 0.642857143) = -0.8724489797

Can't calculate square root of the right side.

The solution to this equation could not be determined.

This subproblem is being ignored because a solution could not be determined.

The solution to this equation could not be determined.

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