-11x^2+3x+13=0

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Solution for -11x^2+3x+13=0 equation:


Simplifying
-11x2 + 3x + 13 = 0

Reorder the terms:
13 + 3x + -11x2 = 0

Solving
13 + 3x + -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'.
-1.181818182 + -0.2727272727x + x2 = 0

Move the constant term to the right:

Add '1.181818182' to each side of the equation.
-1.181818182 + -0.2727272727x + 1.181818182 + x2 = 0 + 1.181818182

Reorder the terms:
-1.181818182 + 1.181818182 + -0.2727272727x + x2 = 0 + 1.181818182

Combine like terms: -1.181818182 + 1.181818182 = 0.000000000
0.000000000 + -0.2727272727x + x2 = 0 + 1.181818182
-0.2727272727x + x2 = 0 + 1.181818182

Combine like terms: 0 + 1.181818182 = 1.181818182
-0.2727272727x + x2 = 1.181818182

The x term is -0.2727272727x.  Take half its coefficient (-0.1363636364).
Square it (0.01859504133) and add it to both sides.

Add '0.01859504133' to each side of the equation.
-0.2727272727x + 0.01859504133 + x2 = 1.181818182 + 0.01859504133

Reorder the terms:
0.01859504133 + -0.2727272727x + x2 = 1.181818182 + 0.01859504133

Combine like terms: 1.181818182 + 0.01859504133 = 1.20041322333
0.01859504133 + -0.2727272727x + x2 = 1.20041322333

Factor a perfect square on the left side:
(x + -0.1363636364)(x + -0.1363636364) = 1.20041322333

Calculate the square root of the right side: 1.095633709

Break this problem into two subproblems by setting 
(x + -0.1363636364) equal to 1.095633709 and -1.095633709.

Subproblem 1

x + -0.1363636364 = 1.095633709 Simplifying x + -0.1363636364 = 1.095633709 Reorder the terms: -0.1363636364 + x = 1.095633709 Solving -0.1363636364 + x = 1.095633709 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1363636364' to each side of the equation. -0.1363636364 + 0.1363636364 + x = 1.095633709 + 0.1363636364 Combine like terms: -0.1363636364 + 0.1363636364 = 0.0000000000 0.0000000000 + x = 1.095633709 + 0.1363636364 x = 1.095633709 + 0.1363636364 Combine like terms: 1.095633709 + 0.1363636364 = 1.2319973454 x = 1.2319973454 Simplifying x = 1.2319973454

Subproblem 2

x + -0.1363636364 = -1.095633709 Simplifying x + -0.1363636364 = -1.095633709 Reorder the terms: -0.1363636364 + x = -1.095633709 Solving -0.1363636364 + x = -1.095633709 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1363636364' to each side of the equation. -0.1363636364 + 0.1363636364 + x = -1.095633709 + 0.1363636364 Combine like terms: -0.1363636364 + 0.1363636364 = 0.0000000000 0.0000000000 + x = -1.095633709 + 0.1363636364 x = -1.095633709 + 0.1363636364 Combine like terms: -1.095633709 + 0.1363636364 = -0.9592700726 x = -0.9592700726 Simplifying x = -0.9592700726

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.2319973454, -0.9592700726}

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