11x^2-234x-7920=0

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Solution for 11x^2-234x-7920=0 equation:


Simplifying
11x2 + -234x + -7920 = 0

Reorder the terms:
-7920 + -234x + 11x2 = 0

Solving
-7920 + -234x + 11x2 = 0

Solving for variable 'x'.

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

Divide each side by '11'.
-720 + -21.27272727x + x2 = 0

Move the constant term to the right:

Add '720' to each side of the equation.
-720 + -21.27272727x + 720 + x2 = 0 + 720

Reorder the terms:
-720 + 720 + -21.27272727x + x2 = 0 + 720

Combine like terms: -720 + 720 = 0
0 + -21.27272727x + x2 = 0 + 720
-21.27272727x + x2 = 0 + 720

Combine like terms: 0 + 720 = 720
-21.27272727x + x2 = 720

The x term is -21.27272727x.  Take half its coefficient (-10.63636364).
Square it (113.1322315) and add it to both sides.

Add '113.1322315' to each side of the equation.
-21.27272727x + 113.1322315 + x2 = 720 + 113.1322315

Reorder the terms:
113.1322315 + -21.27272727x + x2 = 720 + 113.1322315

Combine like terms: 720 + 113.1322315 = 833.1322315
113.1322315 + -21.27272727x + x2 = 833.1322315

Factor a perfect square on the left side:
(x + -10.63636364)(x + -10.63636364) = 833.1322315

Calculate the square root of the right side: 28.864030063

Break this problem into two subproblems by setting 
(x + -10.63636364) equal to 28.864030063 and -28.864030063.

Subproblem 1

x + -10.63636364 = 28.864030063 Simplifying x + -10.63636364 = 28.864030063 Reorder the terms: -10.63636364 + x = 28.864030063 Solving -10.63636364 + x = 28.864030063 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10.63636364' to each side of the equation. -10.63636364 + 10.63636364 + x = 28.864030063 + 10.63636364 Combine like terms: -10.63636364 + 10.63636364 = 0.00000000 0.00000000 + x = 28.864030063 + 10.63636364 x = 28.864030063 + 10.63636364 Combine like terms: 28.864030063 + 10.63636364 = 39.500393703 x = 39.500393703 Simplifying x = 39.500393703

Subproblem 2

x + -10.63636364 = -28.864030063 Simplifying x + -10.63636364 = -28.864030063 Reorder the terms: -10.63636364 + x = -28.864030063 Solving -10.63636364 + x = -28.864030063 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10.63636364' to each side of the equation. -10.63636364 + 10.63636364 + x = -28.864030063 + 10.63636364 Combine like terms: -10.63636364 + 10.63636364 = 0.00000000 0.00000000 + x = -28.864030063 + 10.63636364 x = -28.864030063 + 10.63636364 Combine like terms: -28.864030063 + 10.63636364 = -18.227666423 x = -18.227666423 Simplifying x = -18.227666423

Solution

The solution to the problem is based on the solutions from the subproblems. x = {39.500393703, -18.227666423}

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