11x^2-17x-20=0

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Solution for 11x^2-17x-20=0 equation:


Simplifying
11x2 + -17x + -20 = 0

Reorder the terms:
-20 + -17x + 11x2 = 0

Solving
-20 + -17x + 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'.
-1.818181818 + -1.545454545x + x2 = 0

Move the constant term to the right:

Add '1.818181818' to each side of the equation.
-1.818181818 + -1.545454545x + 1.818181818 + x2 = 0 + 1.818181818

Reorder the terms:
-1.818181818 + 1.818181818 + -1.545454545x + x2 = 0 + 1.818181818

Combine like terms: -1.818181818 + 1.818181818 = 0.000000000
0.000000000 + -1.545454545x + x2 = 0 + 1.818181818
-1.545454545x + x2 = 0 + 1.818181818

Combine like terms: 0 + 1.818181818 = 1.818181818
-1.545454545x + x2 = 1.818181818

The x term is -1.545454545x.  Take half its coefficient (-0.7727272725).
Square it (0.5971074377) and add it to both sides.

Add '0.5971074377' to each side of the equation.
-1.545454545x + 0.5971074377 + x2 = 1.818181818 + 0.5971074377

Reorder the terms:
0.5971074377 + -1.545454545x + x2 = 1.818181818 + 0.5971074377

Combine like terms: 1.818181818 + 0.5971074377 = 2.4152892557
0.5971074377 + -1.545454545x + x2 = 2.4152892557

Factor a perfect square on the left side:
(x + -0.7727272725)(x + -0.7727272725) = 2.4152892557

Calculate the square root of the right side: 1.554120091

Break this problem into two subproblems by setting 
(x + -0.7727272725) equal to 1.554120091 and -1.554120091.

Subproblem 1

x + -0.7727272725 = 1.554120091 Simplifying x + -0.7727272725 = 1.554120091 Reorder the terms: -0.7727272725 + x = 1.554120091 Solving -0.7727272725 + x = 1.554120091 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7727272725' to each side of the equation. -0.7727272725 + 0.7727272725 + x = 1.554120091 + 0.7727272725 Combine like terms: -0.7727272725 + 0.7727272725 = 0.0000000000 0.0000000000 + x = 1.554120091 + 0.7727272725 x = 1.554120091 + 0.7727272725 Combine like terms: 1.554120091 + 0.7727272725 = 2.3268473635 x = 2.3268473635 Simplifying x = 2.3268473635

Subproblem 2

x + -0.7727272725 = -1.554120091 Simplifying x + -0.7727272725 = -1.554120091 Reorder the terms: -0.7727272725 + x = -1.554120091 Solving -0.7727272725 + x = -1.554120091 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7727272725' to each side of the equation. -0.7727272725 + 0.7727272725 + x = -1.554120091 + 0.7727272725 Combine like terms: -0.7727272725 + 0.7727272725 = 0.0000000000 0.0000000000 + x = -1.554120091 + 0.7727272725 x = -1.554120091 + 0.7727272725 Combine like terms: -1.554120091 + 0.7727272725 = -0.7813928185 x = -0.7813928185 Simplifying x = -0.7813928185

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.3268473635, -0.7813928185}

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