0=5x^2+10x-108

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Solution for 0=5x^2+10x-108 equation:


Simplifying
0 = 5x2 + 10x + -108

Reorder the terms:
0 = -108 + 10x + 5x2

Solving
0 = -108 + 10x + 5x2

Solving for variable 'x'.

Combine like terms: 0 + 108 = 108
108 + -10x + -5x2 = -108 + 10x + 5x2 + 108 + -10x + -5x2

Reorder the terms:
108 + -10x + -5x2 = -108 + 108 + 10x + -10x + 5x2 + -5x2

Combine like terms: -108 + 108 = 0
108 + -10x + -5x2 = 0 + 10x + -10x + 5x2 + -5x2
108 + -10x + -5x2 = 10x + -10x + 5x2 + -5x2

Combine like terms: 10x + -10x = 0
108 + -10x + -5x2 = 0 + 5x2 + -5x2
108 + -10x + -5x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0
108 + -10x + -5x2 = 0

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-21.6 + 2x + x2 = 0

Move the constant term to the right:

Add '21.6' to each side of the equation.
-21.6 + 2x + 21.6 + x2 = 0 + 21.6

Reorder the terms:
-21.6 + 21.6 + 2x + x2 = 0 + 21.6

Combine like terms: -21.6 + 21.6 = 0.0
0.0 + 2x + x2 = 0 + 21.6
2x + x2 = 0 + 21.6

Combine like terms: 0 + 21.6 = 21.6
2x + x2 = 21.6

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 21.6 + 1

Reorder the terms:
1 + 2x + x2 = 21.6 + 1

Combine like terms: 21.6 + 1 = 22.6
1 + 2x + x2 = 22.6

Factor a perfect square on the left side:
(x + 1)(x + 1) = 22.6

Calculate the square root of the right side: 4.75394573

Break this problem into two subproblems by setting 
(x + 1) equal to 4.75394573 and -4.75394573.

Subproblem 1

x + 1 = 4.75394573 Simplifying x + 1 = 4.75394573 Reorder the terms: 1 + x = 4.75394573 Solving 1 + x = 4.75394573 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 4.75394573 + -1 Combine like terms: 1 + -1 = 0 0 + x = 4.75394573 + -1 x = 4.75394573 + -1 Combine like terms: 4.75394573 + -1 = 3.75394573 x = 3.75394573 Simplifying x = 3.75394573

Subproblem 2

x + 1 = -4.75394573 Simplifying x + 1 = -4.75394573 Reorder the terms: 1 + x = -4.75394573 Solving 1 + x = -4.75394573 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -4.75394573 + -1 Combine like terms: 1 + -1 = 0 0 + x = -4.75394573 + -1 x = -4.75394573 + -1 Combine like terms: -4.75394573 + -1 = -5.75394573 x = -5.75394573 Simplifying x = -5.75394573

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.75394573, -5.75394573}

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