0=2x^2-11x-14

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Solution for 0=2x^2-11x-14 equation:


Simplifying
0 = 2x2 + -11x + -14

Reorder the terms:
0 = -14 + -11x + 2x2

Solving
0 = -14 + -11x + 2x2

Solving for variable 'x'.

Combine like terms: 0 + 14 = 14
14 + 11x + -2x2 = -14 + -11x + 2x2 + 14 + 11x + -2x2

Reorder the terms:
14 + 11x + -2x2 = -14 + 14 + -11x + 11x + 2x2 + -2x2

Combine like terms: -14 + 14 = 0
14 + 11x + -2x2 = 0 + -11x + 11x + 2x2 + -2x2
14 + 11x + -2x2 = -11x + 11x + 2x2 + -2x2

Combine like terms: -11x + 11x = 0
14 + 11x + -2x2 = 0 + 2x2 + -2x2
14 + 11x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
14 + 11x + -2x2 = 0

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

Divide each side by '-2'.
-7 + -5.5x + x2 = 0

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + -5.5x + 7 + x2 = 0 + 7

Reorder the terms:
-7 + 7 + -5.5x + x2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -5.5x + x2 = 0 + 7
-5.5x + x2 = 0 + 7

Combine like terms: 0 + 7 = 7
-5.5x + x2 = 7

The x term is -5.5x.  Take half its coefficient (-2.75).
Square it (7.5625) and add it to both sides.

Add '7.5625' to each side of the equation.
-5.5x + 7.5625 + x2 = 7 + 7.5625

Reorder the terms:
7.5625 + -5.5x + x2 = 7 + 7.5625

Combine like terms: 7 + 7.5625 = 14.5625
7.5625 + -5.5x + x2 = 14.5625

Factor a perfect square on the left side:
(x + -2.75)(x + -2.75) = 14.5625

Calculate the square root of the right side: 3.816084381

Break this problem into two subproblems by setting 
(x + -2.75) equal to 3.816084381 and -3.816084381.

Subproblem 1

x + -2.75 = 3.816084381 Simplifying x + -2.75 = 3.816084381 Reorder the terms: -2.75 + x = 3.816084381 Solving -2.75 + x = 3.816084381 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + x = 3.816084381 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + x = 3.816084381 + 2.75 x = 3.816084381 + 2.75 Combine like terms: 3.816084381 + 2.75 = 6.566084381 x = 6.566084381 Simplifying x = 6.566084381

Subproblem 2

x + -2.75 = -3.816084381 Simplifying x + -2.75 = -3.816084381 Reorder the terms: -2.75 + x = -3.816084381 Solving -2.75 + x = -3.816084381 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + x = -3.816084381 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + x = -3.816084381 + 2.75 x = -3.816084381 + 2.75 Combine like terms: -3.816084381 + 2.75 = -1.066084381 x = -1.066084381 Simplifying x = -1.066084381

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.566084381, -1.066084381}

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