2x^2-5x=55

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Solution for 2x^2-5x=55 equation:


Simplifying
2x2 + -5x = 55

Reorder the terms:
-5x + 2x2 = 55

Solving
-5x + 2x2 = 55

Solving for variable 'x'.

Reorder the terms:
-55 + -5x + 2x2 = 55 + -55

Combine like terms: 55 + -55 = 0
-55 + -5x + 2x2 = 0

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

Divide each side by '2'.
-27.5 + -2.5x + x2 = 0

Move the constant term to the right:

Add '27.5' to each side of the equation.
-27.5 + -2.5x + 27.5 + x2 = 0 + 27.5

Reorder the terms:
-27.5 + 27.5 + -2.5x + x2 = 0 + 27.5

Combine like terms: -27.5 + 27.5 = 0.0
0.0 + -2.5x + x2 = 0 + 27.5
-2.5x + x2 = 0 + 27.5

Combine like terms: 0 + 27.5 = 27.5
-2.5x + x2 = 27.5

The x term is -2.5x.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5x + 1.5625 + x2 = 27.5 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = 27.5 + 1.5625

Combine like terms: 27.5 + 1.5625 = 29.0625
1.5625 + -2.5x + x2 = 29.0625

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 29.0625

Calculate the square root of the right side: 5.390964663

Break this problem into two subproblems by setting 
(x + -1.25) equal to 5.390964663 and -5.390964663.

Subproblem 1

x + -1.25 = 5.390964663 Simplifying x + -1.25 = 5.390964663 Reorder the terms: -1.25 + x = 5.390964663 Solving -1.25 + x = 5.390964663 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = 5.390964663 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 5.390964663 + 1.25 x = 5.390964663 + 1.25 Combine like terms: 5.390964663 + 1.25 = 6.640964663 x = 6.640964663 Simplifying x = 6.640964663

Subproblem 2

x + -1.25 = -5.390964663 Simplifying x + -1.25 = -5.390964663 Reorder the terms: -1.25 + x = -5.390964663 Solving -1.25 + x = -5.390964663 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = -5.390964663 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -5.390964663 + 1.25 x = -5.390964663 + 1.25 Combine like terms: -5.390964663 + 1.25 = -4.140964663 x = -4.140964663 Simplifying x = -4.140964663

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.640964663, -4.140964663}

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