2x^2+10x-126=0

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Solution for 2x^2+10x-126=0 equation: 


Simplifying
2x2 + 10x + -126 = 0

Reorder the terms:
-126 + 10x + 2x2 = 0

Solving
-126 + 10x + 2x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '2'.
2(-63 + 5x + x2) = 0

Ignore the factor 2.

Subproblem 1
Set the factor '(-63 + 5x + x2)' equal to zero and attempt to solve:

Simplifying
-63 + 5x + x2 = 0

Solving
-63 + 5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '63' to each side of the equation.
-63 + 5x + 63 + x2 = 0 + 63

Reorder the terms:
-63 + 63 + 5x + x2 = 0 + 63

Combine like terms: -63 + 63 = 0
0 + 5x + x2 = 0 + 63
5x + x2 = 0 + 63

Combine like terms: 0 + 63 = 63
5x + x2 = 63

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 63 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 63 + 6.25

Combine like terms: 63 + 6.25 = 69.25
6.25 + 5x + x2 = 69.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 69.25

Calculate the square root of the right side: 8.321658489

Break this problem into two subproblems by setting 
(x + 2.5) equal to 8.321658489 and -8.321658489.


Subproblem 1
x + 2.5 = 8.321658489

Simplifying
x + 2.5 = 8.321658489

Reorder the terms:
2.5 + x = 8.321658489

Solving
2.5 + x = 8.321658489

Solving for variable 'x'.

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

Add '-2.5' to each side of the equation.
2.5 + -2.5 + x = 8.321658489 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + x = 8.321658489 + -2.5
x = 8.321658489 + -2.5

Combine like terms: 8.321658489 + -2.5 = 5.821658489
x = 5.821658489

Simplifying
x = 5.821658489


Subproblem 2
x + 2.5 = -8.321658489

Simplifying
x + 2.5 = -8.321658489

Reorder the terms:
2.5 + x = -8.321658489

Solving
2.5 + x = -8.321658489

Solving for variable 'x'.

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

Add '-2.5' to each side of the equation.
2.5 + -2.5 + x = -8.321658489 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + x = -8.321658489 + -2.5
x = -8.321658489 + -2.5

Combine like terms: -8.321658489 + -2.5 = -10.821658489
x = -10.821658489

Simplifying
x = -10.821658489


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {5.821658489, -10.821658489}
Solution
x = {5.821658489, -10.821658489}

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