2x^2-11.5x=-7.5

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Solution for 2x^2-11.5x=-7.5 equation:


Simplifying
2x2 + -11.5x = -7.5

Reorder the terms:
-11.5x + 2x2 = -7.5

Solving
-11.5x + 2x2 = -7.5

Solving for variable 'x'.

Reorder the terms:
7.5 + -11.5x + 2x2 = -7.5 + 7.5

Combine like terms: -7.5 + 7.5 = 0.0
7.5 + -11.5x + 2x2 = 0.0

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

Divide each side by '2'.
3.75 + -5.75x + x2 = 0.0

Move the constant term to the right:

Add '-3.75' to each side of the equation.
3.75 + -5.75x + -3.75 + x2 = 0.0 + -3.75

Reorder the terms:
3.75 + -3.75 + -5.75x + x2 = 0.0 + -3.75

Combine like terms: 3.75 + -3.75 = 0.00
0.00 + -5.75x + x2 = 0.0 + -3.75
-5.75x + x2 = 0.0 + -3.75

Combine like terms: 0.0 + -3.75 = -3.75
-5.75x + x2 = -3.75

The x term is -5.75x.  Take half its coefficient (-2.875).
Square it (8.265625) and add it to both sides.

Add '8.265625' to each side of the equation.
-5.75x + 8.265625 + x2 = -3.75 + 8.265625

Reorder the terms:
8.265625 + -5.75x + x2 = -3.75 + 8.265625

Combine like terms: -3.75 + 8.265625 = 4.515625
8.265625 + -5.75x + x2 = 4.515625

Factor a perfect square on the left side:
(x + -2.875)(x + -2.875) = 4.515625

Calculate the square root of the right side: 2.125

Break this problem into two subproblems by setting 
(x + -2.875) equal to 2.125 and -2.125.

Subproblem 1

x + -2.875 = 2.125 Simplifying x + -2.875 = 2.125 Reorder the terms: -2.875 + x = 2.125 Solving -2.875 + x = 2.125 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.875' to each side of the equation. -2.875 + 2.875 + x = 2.125 + 2.875 Combine like terms: -2.875 + 2.875 = 0.000 0.000 + x = 2.125 + 2.875 x = 2.125 + 2.875 Combine like terms: 2.125 + 2.875 = 5 x = 5 Simplifying x = 5

Subproblem 2

x + -2.875 = -2.125 Simplifying x + -2.875 = -2.125 Reorder the terms: -2.875 + x = -2.125 Solving -2.875 + x = -2.125 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.875' to each side of the equation. -2.875 + 2.875 + x = -2.125 + 2.875 Combine like terms: -2.875 + 2.875 = 0.000 0.000 + x = -2.125 + 2.875 x = -2.125 + 2.875 Combine like terms: -2.125 + 2.875 = 0.75 x = 0.75 Simplifying x = 0.75

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5, 0.75}

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