5x^2-9x-11=0

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Solution for 5x^2-9x-11=0 equation:


Simplifying
5x2 + -9x + -11 = 0

Reorder the terms:
-11 + -9x + 5x2 = 0

Solving
-11 + -9x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-2.2 + -1.8x + x2 = 0

Move the constant term to the right:

Add '2.2' to each side of the equation.
-2.2 + -1.8x + 2.2 + x2 = 0 + 2.2

Reorder the terms:
-2.2 + 2.2 + -1.8x + x2 = 0 + 2.2

Combine like terms: -2.2 + 2.2 = 0.0
0.0 + -1.8x + x2 = 0 + 2.2
-1.8x + x2 = 0 + 2.2

Combine like terms: 0 + 2.2 = 2.2
-1.8x + x2 = 2.2

The x term is -1.8x.  Take half its coefficient (-0.9).
Square it (0.81) and add it to both sides.

Add '0.81' to each side of the equation.
-1.8x + 0.81 + x2 = 2.2 + 0.81

Reorder the terms:
0.81 + -1.8x + x2 = 2.2 + 0.81

Combine like terms: 2.2 + 0.81 = 3.01
0.81 + -1.8x + x2 = 3.01

Factor a perfect square on the left side:
(x + -0.9)(x + -0.9) = 3.01

Calculate the square root of the right side: 1.734935157

Break this problem into two subproblems by setting 
(x + -0.9) equal to 1.734935157 and -1.734935157.

Subproblem 1

x + -0.9 = 1.734935157 Simplifying x + -0.9 = 1.734935157 Reorder the terms: -0.9 + x = 1.734935157 Solving -0.9 + x = 1.734935157 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + x = 1.734935157 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + x = 1.734935157 + 0.9 x = 1.734935157 + 0.9 Combine like terms: 1.734935157 + 0.9 = 2.634935157 x = 2.634935157 Simplifying x = 2.634935157

Subproblem 2

x + -0.9 = -1.734935157 Simplifying x + -0.9 = -1.734935157 Reorder the terms: -0.9 + x = -1.734935157 Solving -0.9 + x = -1.734935157 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + x = -1.734935157 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + x = -1.734935157 + 0.9 x = -1.734935157 + 0.9 Combine like terms: -1.734935157 + 0.9 = -0.834935157 x = -0.834935157 Simplifying x = -0.834935157

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.634935157, -0.834935157}

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