11x^2+4x=20

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Solution for 11x^2+4x=20 equation:


Simplifying
11x2 + 4x = 20

Reorder the terms:
4x + 11x2 = 20

Solving
4x + 11x2 = 20

Solving for variable 'x'.

Reorder the terms:
-20 + 4x + 11x2 = 20 + -20

Combine like terms: 20 + -20 = 0
-20 + 4x + 11x2 = 0

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

Divide each side by '11'.
-1.818181818 + 0.3636363636x + x2 = 0

Move the constant term to the right:

Add '1.818181818' to each side of the equation.
-1.818181818 + 0.3636363636x + 1.818181818 + x2 = 0 + 1.818181818

Reorder the terms:
-1.818181818 + 1.818181818 + 0.3636363636x + x2 = 0 + 1.818181818

Combine like terms: -1.818181818 + 1.818181818 = 0.000000000
0.000000000 + 0.3636363636x + x2 = 0 + 1.818181818
0.3636363636x + x2 = 0 + 1.818181818

Combine like terms: 0 + 1.818181818 = 1.818181818
0.3636363636x + x2 = 1.818181818

The x term is 0.3636363636x.  Take half its coefficient (0.1818181818).
Square it (0.03305785123) and add it to both sides.

Add '0.03305785123' to each side of the equation.
0.3636363636x + 0.03305785123 + x2 = 1.818181818 + 0.03305785123

Reorder the terms:
0.03305785123 + 0.3636363636x + x2 = 1.818181818 + 0.03305785123

Combine like terms: 1.818181818 + 0.03305785123 = 1.85123966923
0.03305785123 + 0.3636363636x + x2 = 1.85123966923

Factor a perfect square on the left side:
(x + 0.1818181818)(x + 0.1818181818) = 1.85123966923

Calculate the square root of the right side: 1.360602686

Break this problem into two subproblems by setting 
(x + 0.1818181818) equal to 1.360602686 and -1.360602686.

Subproblem 1

x + 0.1818181818 = 1.360602686 Simplifying x + 0.1818181818 = 1.360602686 Reorder the terms: 0.1818181818 + x = 1.360602686 Solving 0.1818181818 + x = 1.360602686 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1818181818' to each side of the equation. 0.1818181818 + -0.1818181818 + x = 1.360602686 + -0.1818181818 Combine like terms: 0.1818181818 + -0.1818181818 = 0.0000000000 0.0000000000 + x = 1.360602686 + -0.1818181818 x = 1.360602686 + -0.1818181818 Combine like terms: 1.360602686 + -0.1818181818 = 1.1787845042 x = 1.1787845042 Simplifying x = 1.1787845042

Subproblem 2

x + 0.1818181818 = -1.360602686 Simplifying x + 0.1818181818 = -1.360602686 Reorder the terms: 0.1818181818 + x = -1.360602686 Solving 0.1818181818 + x = -1.360602686 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1818181818' to each side of the equation. 0.1818181818 + -0.1818181818 + x = -1.360602686 + -0.1818181818 Combine like terms: 0.1818181818 + -0.1818181818 = 0.0000000000 0.0000000000 + x = -1.360602686 + -0.1818181818 x = -1.360602686 + -0.1818181818 Combine like terms: -1.360602686 + -0.1818181818 = -1.5424208678 x = -1.5424208678 Simplifying x = -1.5424208678

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.1787845042, -1.5424208678}

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