2x^2+7x-108=0

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Solution for 2x^2+7x-108=0 equation:


Simplifying
2x2 + 7x + -108 = 0

Reorder the terms:
-108 + 7x + 2x2 = 0

Solving
-108 + 7x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-54 + 3.5x + x2 = 0

Move the constant term to the right:

Add '54' to each side of the equation.
-54 + 3.5x + 54 + x2 = 0 + 54

Reorder the terms:
-54 + 54 + 3.5x + x2 = 0 + 54

Combine like terms: -54 + 54 = 0
0 + 3.5x + x2 = 0 + 54
3.5x + x2 = 0 + 54

Combine like terms: 0 + 54 = 54
3.5x + x2 = 54

The x term is 3.5x.  Take half its coefficient (1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
3.5x + 3.0625 + x2 = 54 + 3.0625

Reorder the terms:
3.0625 + 3.5x + x2 = 54 + 3.0625

Combine like terms: 54 + 3.0625 = 57.0625
3.0625 + 3.5x + x2 = 57.0625

Factor a perfect square on the left side:
(x + 1.75)(x + 1.75) = 57.0625

Calculate the square root of the right side: 7.553972465

Break this problem into two subproblems by setting 
(x + 1.75) equal to 7.553972465 and -7.553972465.

Subproblem 1

x + 1.75 = 7.553972465 Simplifying x + 1.75 = 7.553972465 Reorder the terms: 1.75 + x = 7.553972465 Solving 1.75 + x = 7.553972465 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x = 7.553972465 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = 7.553972465 + -1.75 x = 7.553972465 + -1.75 Combine like terms: 7.553972465 + -1.75 = 5.803972465 x = 5.803972465 Simplifying x = 5.803972465

Subproblem 2

x + 1.75 = -7.553972465 Simplifying x + 1.75 = -7.553972465 Reorder the terms: 1.75 + x = -7.553972465 Solving 1.75 + x = -7.553972465 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x = -7.553972465 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = -7.553972465 + -1.75 x = -7.553972465 + -1.75 Combine like terms: -7.553972465 + -1.75 = -9.303972465 x = -9.303972465 Simplifying x = -9.303972465

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.803972465, -9.303972465}

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