x^2+16x-660=0

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Solution for x^2+16x-660=0 equation:


Simplifying
x2 + 16x + -660 = 0

Reorder the terms:
-660 + 16x + x2 = 0

Solving
-660 + 16x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '660' to each side of the equation.
-660 + 16x + 660 + x2 = 0 + 660

Reorder the terms:
-660 + 660 + 16x + x2 = 0 + 660

Combine like terms: -660 + 660 = 0
0 + 16x + x2 = 0 + 660
16x + x2 = 0 + 660

Combine like terms: 0 + 660 = 660
16x + x2 = 660

The x term is 16x.  Take half its coefficient (8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
16x + 64 + x2 = 660 + 64

Reorder the terms:
64 + 16x + x2 = 660 + 64

Combine like terms: 660 + 64 = 724
64 + 16x + x2 = 724

Factor a perfect square on the left side:
(x + 8)(x + 8) = 724

Calculate the square root of the right side: 26.907248094

Break this problem into two subproblems by setting 
(x + 8) equal to 26.907248094 and -26.907248094.

Subproblem 1

x + 8 = 26.907248094 Simplifying x + 8 = 26.907248094 Reorder the terms: 8 + x = 26.907248094 Solving 8 + x = 26.907248094 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = 26.907248094 + -8 Combine like terms: 8 + -8 = 0 0 + x = 26.907248094 + -8 x = 26.907248094 + -8 Combine like terms: 26.907248094 + -8 = 18.907248094 x = 18.907248094 Simplifying x = 18.907248094

Subproblem 2

x + 8 = -26.907248094 Simplifying x + 8 = -26.907248094 Reorder the terms: 8 + x = -26.907248094 Solving 8 + x = -26.907248094 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = -26.907248094 + -8 Combine like terms: 8 + -8 = 0 0 + x = -26.907248094 + -8 x = -26.907248094 + -8 Combine like terms: -26.907248094 + -8 = -34.907248094 x = -34.907248094 Simplifying x = -34.907248094

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.907248094, -34.907248094}

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