11x^2+11x-8=0

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Solution for 11x^2+11x-8=0 equation:


Simplifying
11x2 + 11x + -8 = 0

Reorder the terms:
-8 + 11x + 11x2 = 0

Solving
-8 + 11x + 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'.
-0.7272727273 + x + x2 = 0

Move the constant term to the right:

Add '0.7272727273' to each side of the equation.
-0.7272727273 + x + 0.7272727273 + x2 = 0 + 0.7272727273

Reorder the terms:
-0.7272727273 + 0.7272727273 + x + x2 = 0 + 0.7272727273

Combine like terms: -0.7272727273 + 0.7272727273 = 0.0000000000
0.0000000000 + x + x2 = 0 + 0.7272727273
x + x2 = 0 + 0.7272727273

Combine like terms: 0 + 0.7272727273 = 0.7272727273
x + x2 = 0.7272727273

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 0.7272727273 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 0.7272727273 + 0.25

Combine like terms: 0.7272727273 + 0.25 = 0.9772727273
1.25 + x2 = 0.9772727273

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 0.9772727273

Calculate the square root of the right side: 0.988571053

Break this problem into two subproblems by setting 
(x + 0.5) equal to 0.988571053 and -0.988571053.

Subproblem 1

x + 0.5 = 0.988571053 Simplifying x + 0.5 = 0.988571053 Reorder the terms: 0.5 + x = 0.988571053 Solving 0.5 + x = 0.988571053 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 0.988571053 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 0.988571053 + -0.5 x = 0.988571053 + -0.5 Combine like terms: 0.988571053 + -0.5 = 0.488571053 x = 0.488571053 Simplifying x = 0.488571053

Subproblem 2

x + 0.5 = -0.988571053 Simplifying x + 0.5 = -0.988571053 Reorder the terms: 0.5 + x = -0.988571053 Solving 0.5 + x = -0.988571053 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -0.988571053 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -0.988571053 + -0.5 x = -0.988571053 + -0.5 Combine like terms: -0.988571053 + -0.5 = -1.488571053 x = -1.488571053 Simplifying x = -1.488571053

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.488571053, -1.488571053}

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