11x^2+13x-72=0

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Solution for 11x^2+13x-72=0 equation:


Simplifying
11x2 + 13x + -72 = 0

Reorder the terms:
-72 + 13x + 11x2 = 0

Solving
-72 + 13x + 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'.
-6.545454545 + 1.181818182x + x2 = 0

Move the constant term to the right:

Add '6.545454545' to each side of the equation.
-6.545454545 + 1.181818182x + 6.545454545 + x2 = 0 + 6.545454545

Reorder the terms:
-6.545454545 + 6.545454545 + 1.181818182x + x2 = 0 + 6.545454545

Combine like terms: -6.545454545 + 6.545454545 = 0.000000000
0.000000000 + 1.181818182x + x2 = 0 + 6.545454545
1.181818182x + x2 = 0 + 6.545454545

Combine like terms: 0 + 6.545454545 = 6.545454545
1.181818182x + x2 = 6.545454545

The x term is 1.181818182x.  Take half its coefficient (0.590909091).
Square it (0.3491735538) and add it to both sides.

Add '0.3491735538' to each side of the equation.
1.181818182x + 0.3491735538 + x2 = 6.545454545 + 0.3491735538

Reorder the terms:
0.3491735538 + 1.181818182x + x2 = 6.545454545 + 0.3491735538

Combine like terms: 6.545454545 + 0.3491735538 = 6.8946280988
0.3491735538 + 1.181818182x + x2 = 6.8946280988

Factor a perfect square on the left side:
(x + 0.590909091)(x + 0.590909091) = 6.8946280988

Calculate the square root of the right side: 2.625762384

Break this problem into two subproblems by setting 
(x + 0.590909091) equal to 2.625762384 and -2.625762384.

Subproblem 1

x + 0.590909091 = 2.625762384 Simplifying x + 0.590909091 = 2.625762384 Reorder the terms: 0.590909091 + x = 2.625762384 Solving 0.590909091 + x = 2.625762384 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.590909091' to each side of the equation. 0.590909091 + -0.590909091 + x = 2.625762384 + -0.590909091 Combine like terms: 0.590909091 + -0.590909091 = 0.000000000 0.000000000 + x = 2.625762384 + -0.590909091 x = 2.625762384 + -0.590909091 Combine like terms: 2.625762384 + -0.590909091 = 2.034853293 x = 2.034853293 Simplifying x = 2.034853293

Subproblem 2

x + 0.590909091 = -2.625762384 Simplifying x + 0.590909091 = -2.625762384 Reorder the terms: 0.590909091 + x = -2.625762384 Solving 0.590909091 + x = -2.625762384 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.590909091' to each side of the equation. 0.590909091 + -0.590909091 + x = -2.625762384 + -0.590909091 Combine like terms: 0.590909091 + -0.590909091 = 0.000000000 0.000000000 + x = -2.625762384 + -0.590909091 x = -2.625762384 + -0.590909091 Combine like terms: -2.625762384 + -0.590909091 = -3.216671475 x = -3.216671475 Simplifying x = -3.216671475

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.034853293, -3.216671475}

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