-7-7n^2=-399

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Solution for -7-7n^2=-399 equation: 


Simplifying
-7 + -7n2 = -399

Solving
-7 + -7n2 = -399

Solving for variable 'n'.

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

Add '7' to each side of the equation.
-7 + 7 + -7n2 = -399 + 7

Combine like terms: -7 + 7 = 0
0 + -7n2 = -399 + 7
-7n2 = -399 + 7

Combine like terms: -399 + 7 = -392
-7n2 = -392

Divide each side by '-7'.
n2 = 56

Simplifying
n2 = 56

Take the square root of each side:
n = {-7.483314774, 7.483314774}

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