11x^2+5x-1=0

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Solution for 11x^2+5x-1=0 equation:


Simplifying
11x2 + 5x + -1 = 0

Reorder the terms:
-1 + 5x + 11x2 = 0

Solving
-1 + 5x + 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'.
-0.09090909091 + 0.4545454545x + x2 = 0

Move the constant term to the right:

Add '0.09090909091' to each side of the equation.
-0.09090909091 + 0.4545454545x + 0.09090909091 + x2 = 0 + 0.09090909091

Reorder the terms:
-0.09090909091 + 0.09090909091 + 0.4545454545x + x2 = 0 + 0.09090909091

Combine like terms: -0.09090909091 + 0.09090909091 = 0.00000000000
0.00000000000 + 0.4545454545x + x2 = 0 + 0.09090909091
0.4545454545x + x2 = 0 + 0.09090909091

Combine like terms: 0 + 0.09090909091 = 0.09090909091
0.4545454545x + x2 = 0.09090909091

The x term is 0.4545454545x.  Take half its coefficient (0.2272727273).
Square it (0.05165289257) and add it to both sides.

Add '0.05165289257' to each side of the equation.
0.4545454545x + 0.05165289257 + x2 = 0.09090909091 + 0.05165289257

Reorder the terms:
0.05165289257 + 0.4545454545x + x2 = 0.09090909091 + 0.05165289257

Combine like terms: 0.09090909091 + 0.05165289257 = 0.14256198348
0.05165289257 + 0.4545454545x + x2 = 0.14256198348

Factor a perfect square on the left side:
(x + 0.2272727273)(x + 0.2272727273) = 0.14256198348

Calculate the square root of the right side: 0.377573812

Break this problem into two subproblems by setting 
(x + 0.2272727273) equal to 0.377573812 and -0.377573812.

Subproblem 1

x + 0.2272727273 = 0.377573812 Simplifying x + 0.2272727273 = 0.377573812 Reorder the terms: 0.2272727273 + x = 0.377573812 Solving 0.2272727273 + x = 0.377573812 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2272727273' to each side of the equation. 0.2272727273 + -0.2272727273 + x = 0.377573812 + -0.2272727273 Combine like terms: 0.2272727273 + -0.2272727273 = 0.0000000000 0.0000000000 + x = 0.377573812 + -0.2272727273 x = 0.377573812 + -0.2272727273 Combine like terms: 0.377573812 + -0.2272727273 = 0.1503010847 x = 0.1503010847 Simplifying x = 0.1503010847

Subproblem 2

x + 0.2272727273 = -0.377573812 Simplifying x + 0.2272727273 = -0.377573812 Reorder the terms: 0.2272727273 + x = -0.377573812 Solving 0.2272727273 + x = -0.377573812 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2272727273' to each side of the equation. 0.2272727273 + -0.2272727273 + x = -0.377573812 + -0.2272727273 Combine like terms: 0.2272727273 + -0.2272727273 = 0.0000000000 0.0000000000 + x = -0.377573812 + -0.2272727273 x = -0.377573812 + -0.2272727273 Combine like terms: -0.377573812 + -0.2272727273 = -0.6048465393 x = -0.6048465393 Simplifying x = -0.6048465393

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.1503010847, -0.6048465393}

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