11x^2-4x-225=0

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Solution for 11x^2-4x-225=0 equation:


Simplifying
11x2 + -4x + -225 = 0

Reorder the terms:
-225 + -4x + 11x2 = 0

Solving
-225 + -4x + 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'.
-20.45454545 + -0.3636363636x + x2 = 0

Move the constant term to the right:

Add '20.45454545' to each side of the equation.
-20.45454545 + -0.3636363636x + 20.45454545 + x2 = 0 + 20.45454545

Reorder the terms:
-20.45454545 + 20.45454545 + -0.3636363636x + x2 = 0 + 20.45454545

Combine like terms: -20.45454545 + 20.45454545 = 0.00000000
0.00000000 + -0.3636363636x + x2 = 0 + 20.45454545
-0.3636363636x + x2 = 0 + 20.45454545

Combine like terms: 0 + 20.45454545 = 20.45454545
-0.3636363636x + x2 = 20.45454545

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 = 20.45454545 + 0.03305785123

Reorder the terms:
0.03305785123 + -0.3636363636x + x2 = 20.45454545 + 0.03305785123

Combine like terms: 20.45454545 + 0.03305785123 = 20.48760330123
0.03305785123 + -0.3636363636x + x2 = 20.48760330123

Factor a perfect square on the left side:
(x + -0.1818181818)(x + -0.1818181818) = 20.48760330123

Calculate the square root of the right side: 4.526323376

Break this problem into two subproblems by setting 
(x + -0.1818181818) equal to 4.526323376 and -4.526323376.

Subproblem 1

x + -0.1818181818 = 4.526323376 Simplifying x + -0.1818181818 = 4.526323376 Reorder the terms: -0.1818181818 + x = 4.526323376 Solving -0.1818181818 + x = 4.526323376 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 = 4.526323376 + 0.1818181818 Combine like terms: -0.1818181818 + 0.1818181818 = 0.0000000000 0.0000000000 + x = 4.526323376 + 0.1818181818 x = 4.526323376 + 0.1818181818 Combine like terms: 4.526323376 + 0.1818181818 = 4.7081415578 x = 4.7081415578 Simplifying x = 4.7081415578

Subproblem 2

x + -0.1818181818 = -4.526323376 Simplifying x + -0.1818181818 = -4.526323376 Reorder the terms: -0.1818181818 + x = -4.526323376 Solving -0.1818181818 + x = -4.526323376 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 = -4.526323376 + 0.1818181818 Combine like terms: -0.1818181818 + 0.1818181818 = 0.0000000000 0.0000000000 + x = -4.526323376 + 0.1818181818 x = -4.526323376 + 0.1818181818 Combine like terms: -4.526323376 + 0.1818181818 = -4.3445051942 x = -4.3445051942 Simplifying x = -4.3445051942

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.7081415578, -4.3445051942}

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