11x^2+3x-15=-5

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Solution for 11x^2+3x-15=-5 equation:


Simplifying
11x2 + 3x + -15 = -5

Reorder the terms:
-15 + 3x + 11x2 = -5

Solving
-15 + 3x + 11x2 = -5

Solving for variable 'x'.

Reorder the terms:
-15 + 5 + 3x + 11x2 = -5 + 5

Combine like terms: -15 + 5 = -10
-10 + 3x + 11x2 = -5 + 5

Combine like terms: -5 + 5 = 0
-10 + 3x + 11x2 = 0

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

Divide each side by '11'.
-0.9090909091 + 0.2727272727x + x2 = 0

Move the constant term to the right:

Add '0.9090909091' to each side of the equation.
-0.9090909091 + 0.2727272727x + 0.9090909091 + x2 = 0 + 0.9090909091

Reorder the terms:
-0.9090909091 + 0.9090909091 + 0.2727272727x + x2 = 0 + 0.9090909091

Combine like terms: -0.9090909091 + 0.9090909091 = 0.0000000000
0.0000000000 + 0.2727272727x + x2 = 0 + 0.9090909091
0.2727272727x + x2 = 0 + 0.9090909091

Combine like terms: 0 + 0.9090909091 = 0.9090909091
0.2727272727x + x2 = 0.9090909091

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 = 0.9090909091 + 0.01859504133

Reorder the terms:
0.01859504133 + 0.2727272727x + x2 = 0.9090909091 + 0.01859504133

Combine like terms: 0.9090909091 + 0.01859504133 = 0.92768595043
0.01859504133 + 0.2727272727x + x2 = 0.92768595043

Factor a perfect square on the left side:
(x + 0.1363636364)(x + 0.1363636364) = 0.92768595043

Calculate the square root of the right side: 0.96316455

Break this problem into two subproblems by setting 
(x + 0.1363636364) equal to 0.96316455 and -0.96316455.

Subproblem 1

x + 0.1363636364 = 0.96316455 Simplifying x + 0.1363636364 = 0.96316455 Reorder the terms: 0.1363636364 + x = 0.96316455 Solving 0.1363636364 + x = 0.96316455 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 = 0.96316455 + -0.1363636364 Combine like terms: 0.1363636364 + -0.1363636364 = 0.0000000000 0.0000000000 + x = 0.96316455 + -0.1363636364 x = 0.96316455 + -0.1363636364 Combine like terms: 0.96316455 + -0.1363636364 = 0.8268009136 x = 0.8268009136 Simplifying x = 0.8268009136

Subproblem 2

x + 0.1363636364 = -0.96316455 Simplifying x + 0.1363636364 = -0.96316455 Reorder the terms: 0.1363636364 + x = -0.96316455 Solving 0.1363636364 + x = -0.96316455 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 = -0.96316455 + -0.1363636364 Combine like terms: 0.1363636364 + -0.1363636364 = 0.0000000000 0.0000000000 + x = -0.96316455 + -0.1363636364 x = -0.96316455 + -0.1363636364 Combine like terms: -0.96316455 + -0.1363636364 = -1.0995281864 x = -1.0995281864 Simplifying x = -1.0995281864

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.8268009136, -1.0995281864}

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