-11x^2+5x+4=0

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Solution for -11x^2+5x+4=0 equation:


Simplifying
-11x2 + 5x + 4 = 0

Reorder the terms:
4 + 5x + -11x2 = 0

Solving
4 + 5x + -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'.
-0.3636363636 + -0.4545454545x + x2 = 0

Move the constant term to the right:

Add '0.3636363636' to each side of the equation.
-0.3636363636 + -0.4545454545x + 0.3636363636 + x2 = 0 + 0.3636363636

Reorder the terms:
-0.3636363636 + 0.3636363636 + -0.4545454545x + x2 = 0 + 0.3636363636

Combine like terms: -0.3636363636 + 0.3636363636 = 0.0000000000
0.0000000000 + -0.4545454545x + x2 = 0 + 0.3636363636
-0.4545454545x + x2 = 0 + 0.3636363636

Combine like terms: 0 + 0.3636363636 = 0.3636363636
-0.4545454545x + x2 = 0.3636363636

The x term is -0.4545454545x.  Take half its coefficient (-0.2272727273).
Square it (0.05165289257) and add it to both sides.

Add '0.05165289257' to each side of the equation.
-0.4545454545x + 0.05165289257 + x2 = 0.3636363636 + 0.05165289257

Reorder the terms:
0.05165289257 + -0.4545454545x + x2 = 0.3636363636 + 0.05165289257

Combine like terms: 0.3636363636 + 0.05165289257 = 0.41528925617
0.05165289257 + -0.4545454545x + x2 = 0.41528925617

Factor a perfect square on the left side:
(x + -0.2272727273)(x + -0.2272727273) = 0.41528925617

Calculate the square root of the right side: 0.644429404

Break this problem into two subproblems by setting 
(x + -0.2272727273) equal to 0.644429404 and -0.644429404.

Subproblem 1

x + -0.2272727273 = 0.644429404 Simplifying x + -0.2272727273 = 0.644429404 Reorder the terms: -0.2272727273 + x = 0.644429404 Solving -0.2272727273 + x = 0.644429404 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2272727273' to each side of the equation. -0.2272727273 + 0.2272727273 + x = 0.644429404 + 0.2272727273 Combine like terms: -0.2272727273 + 0.2272727273 = 0.0000000000 0.0000000000 + x = 0.644429404 + 0.2272727273 x = 0.644429404 + 0.2272727273 Combine like terms: 0.644429404 + 0.2272727273 = 0.8717021313 x = 0.8717021313 Simplifying x = 0.8717021313

Subproblem 2

x + -0.2272727273 = -0.644429404 Simplifying x + -0.2272727273 = -0.644429404 Reorder the terms: -0.2272727273 + x = -0.644429404 Solving -0.2272727273 + x = -0.644429404 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2272727273' to each side of the equation. -0.2272727273 + 0.2272727273 + x = -0.644429404 + 0.2272727273 Combine like terms: -0.2272727273 + 0.2272727273 = 0.0000000000 0.0000000000 + x = -0.644429404 + 0.2272727273 x = -0.644429404 + 0.2272727273 Combine like terms: -0.644429404 + 0.2272727273 = -0.4171566767 x = -0.4171566767 Simplifying x = -0.4171566767

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.8717021313, -0.4171566767}

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