11X^2+3X-5=8

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Solution for 11X^2+3X-5=8 equation:


Simplifying
11X2 + 3X + -5 = 8

Reorder the terms:
-5 + 3X + 11X2 = 8

Solving
-5 + 3X + 11X2 = 8

Solving for variable 'X'.

Reorder the terms:
-5 + -8 + 3X + 11X2 = 8 + -8

Combine like terms: -5 + -8 = -13
-13 + 3X + 11X2 = 8 + -8

Combine like terms: 8 + -8 = 0
-13 + 3X + 11X2 = 0

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 = 0.9592700726 X = 0.9592700726 Simplifying X = 0.9592700726

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 = -1.2319973454 X = -1.2319973454 Simplifying X = -1.2319973454

Solution

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

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