2x^2=5x+11

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Solution for 2x^2=5x+11 equation:


Simplifying
2x2 = 5x + 11

Reorder the terms:
2x2 = 11 + 5x

Solving
2x2 = 11 + 5x

Solving for variable 'x'.

Reorder the terms:
-11 + -5x + 2x2 = 11 + 5x + -11 + -5x

Reorder the terms:
-11 + -5x + 2x2 = 11 + -11 + 5x + -5x

Combine like terms: 11 + -11 = 0
-11 + -5x + 2x2 = 0 + 5x + -5x
-11 + -5x + 2x2 = 5x + -5x

Combine like terms: 5x + -5x = 0
-11 + -5x + 2x2 = 0

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

Divide each side by '2'.
-5.5 + -2.5x + x2 = 0

Move the constant term to the right:

Add '5.5' to each side of the equation.
-5.5 + -2.5x + 5.5 + x2 = 0 + 5.5

Reorder the terms:
-5.5 + 5.5 + -2.5x + x2 = 0 + 5.5

Combine like terms: -5.5 + 5.5 = 0.0
0.0 + -2.5x + x2 = 0 + 5.5
-2.5x + x2 = 0 + 5.5

Combine like terms: 0 + 5.5 = 5.5
-2.5x + x2 = 5.5

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 = 5.5 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = 5.5 + 1.5625

Combine like terms: 5.5 + 1.5625 = 7.0625
1.5625 + -2.5x + x2 = 7.0625

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 7.0625

Calculate the square root of the right side: 2.657536453

Break this problem into two subproblems by setting 
(x + -1.25) equal to 2.657536453 and -2.657536453.

Subproblem 1

x + -1.25 = 2.657536453 Simplifying x + -1.25 = 2.657536453 Reorder the terms: -1.25 + x = 2.657536453 Solving -1.25 + x = 2.657536453 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 = 2.657536453 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 2.657536453 + 1.25 x = 2.657536453 + 1.25 Combine like terms: 2.657536453 + 1.25 = 3.907536453 x = 3.907536453 Simplifying x = 3.907536453

Subproblem 2

x + -1.25 = -2.657536453 Simplifying x + -1.25 = -2.657536453 Reorder the terms: -1.25 + x = -2.657536453 Solving -1.25 + x = -2.657536453 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 = -2.657536453 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -2.657536453 + 1.25 x = -2.657536453 + 1.25 Combine like terms: -2.657536453 + 1.25 = -1.407536453 x = -1.407536453 Simplifying x = -1.407536453

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.907536453, -1.407536453}

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