11x^2+20x-2=0

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Solution for 11x^2+20x-2=0 equation:


Simplifying
11x2 + 20x + -2 = 0

Reorder the terms:
-2 + 20x + 11x2 = 0

Solving
-2 + 20x + 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'.
-0.1818181818 + 1.818181818x + x2 = 0

Move the constant term to the right:

Add '0.1818181818' to each side of the equation.
-0.1818181818 + 1.818181818x + 0.1818181818 + x2 = 0 + 0.1818181818

Reorder the terms:
-0.1818181818 + 0.1818181818 + 1.818181818x + x2 = 0 + 0.1818181818

Combine like terms: -0.1818181818 + 0.1818181818 = 0.0000000000
0.0000000000 + 1.818181818x + x2 = 0 + 0.1818181818
1.818181818x + x2 = 0 + 0.1818181818

Combine like terms: 0 + 0.1818181818 = 0.1818181818
1.818181818x + x2 = 0.1818181818

The x term is 1.818181818x.  Take half its coefficient (0.909090909).
Square it (0.8264462808) and add it to both sides.

Add '0.8264462808' to each side of the equation.
1.818181818x + 0.8264462808 + x2 = 0.1818181818 + 0.8264462808

Reorder the terms:
0.8264462808 + 1.818181818x + x2 = 0.1818181818 + 0.8264462808

Combine like terms: 0.1818181818 + 0.8264462808 = 1.0082644626
0.8264462808 + 1.818181818x + x2 = 1.0082644626

Factor a perfect square on the left side:
(x + 0.909090909)(x + 0.909090909) = 1.0082644626

Calculate the square root of the right side: 1.004123729

Break this problem into two subproblems by setting 
(x + 0.909090909) equal to 1.004123729 and -1.004123729.

Subproblem 1

x + 0.909090909 = 1.004123729 Simplifying x + 0.909090909 = 1.004123729 Reorder the terms: 0.909090909 + x = 1.004123729 Solving 0.909090909 + x = 1.004123729 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.909090909' to each side of the equation. 0.909090909 + -0.909090909 + x = 1.004123729 + -0.909090909 Combine like terms: 0.909090909 + -0.909090909 = 0.000000000 0.000000000 + x = 1.004123729 + -0.909090909 x = 1.004123729 + -0.909090909 Combine like terms: 1.004123729 + -0.909090909 = 0.09503282 x = 0.09503282 Simplifying x = 0.09503282

Subproblem 2

x + 0.909090909 = -1.004123729 Simplifying x + 0.909090909 = -1.004123729 Reorder the terms: 0.909090909 + x = -1.004123729 Solving 0.909090909 + x = -1.004123729 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.909090909' to each side of the equation. 0.909090909 + -0.909090909 + x = -1.004123729 + -0.909090909 Combine like terms: 0.909090909 + -0.909090909 = 0.000000000 0.000000000 + x = -1.004123729 + -0.909090909 x = -1.004123729 + -0.909090909 Combine like terms: -1.004123729 + -0.909090909 = -1.913214638 x = -1.913214638 Simplifying x = -1.913214638

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.09503282, -1.913214638}

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