11x^2+21x-14=0

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Solution for 11x^2+21x-14=0 equation:


Simplifying
11x2 + 21x + -14 = 0

Reorder the terms:
-14 + 21x + 11x2 = 0

Solving
-14 + 21x + 11x2 = 0

Solving for variable 'x'.

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

Divide each side by '11'.
-1.272727273 + 1.909090909x + x2 = 0

Move the constant term to the right:

Add '1.272727273' to each side of the equation.
-1.272727273 + 1.909090909x + 1.272727273 + x2 = 0 + 1.272727273

Reorder the terms:
-1.272727273 + 1.272727273 + 1.909090909x + x2 = 0 + 1.272727273

Combine like terms: -1.272727273 + 1.272727273 = 0.000000000
0.000000000 + 1.909090909x + x2 = 0 + 1.272727273
1.909090909x + x2 = 0 + 1.272727273

Combine like terms: 0 + 1.272727273 = 1.272727273
1.909090909x + x2 = 1.272727273

The x term is 1.909090909x.  Take half its coefficient (0.9545454545).
Square it (0.9111570247) and add it to both sides.

Add '0.9111570247' to each side of the equation.
1.909090909x + 0.9111570247 + x2 = 1.272727273 + 0.9111570247

Reorder the terms:
0.9111570247 + 1.909090909x + x2 = 1.272727273 + 0.9111570247

Combine like terms: 1.272727273 + 0.9111570247 = 2.1838842977
0.9111570247 + 1.909090909x + x2 = 2.1838842977

Factor a perfect square on the left side:
(x + 0.9545454545)(x + 0.9545454545) = 2.1838842977

Calculate the square root of the right side: 1.47779711

Break this problem into two subproblems by setting 
(x + 0.9545454545) equal to 1.47779711 and -1.47779711.

Subproblem 1

x + 0.9545454545 = 1.47779711 Simplifying x + 0.9545454545 = 1.47779711 Reorder the terms: 0.9545454545 + x = 1.47779711 Solving 0.9545454545 + x = 1.47779711 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9545454545' to each side of the equation. 0.9545454545 + -0.9545454545 + x = 1.47779711 + -0.9545454545 Combine like terms: 0.9545454545 + -0.9545454545 = 0.0000000000 0.0000000000 + x = 1.47779711 + -0.9545454545 x = 1.47779711 + -0.9545454545 Combine like terms: 1.47779711 + -0.9545454545 = 0.5232516555 x = 0.5232516555 Simplifying x = 0.5232516555

Subproblem 2

x + 0.9545454545 = -1.47779711 Simplifying x + 0.9545454545 = -1.47779711 Reorder the terms: 0.9545454545 + x = -1.47779711 Solving 0.9545454545 + x = -1.47779711 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9545454545' to each side of the equation. 0.9545454545 + -0.9545454545 + x = -1.47779711 + -0.9545454545 Combine like terms: 0.9545454545 + -0.9545454545 = 0.0000000000 0.0000000000 + x = -1.47779711 + -0.9545454545 x = -1.47779711 + -0.9545454545 Combine like terms: -1.47779711 + -0.9545454545 = -2.4323425645 x = -2.4323425645 Simplifying x = -2.4323425645

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.5232516555, -2.4323425645}

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