-2*x^2-15*x+11=

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Solution for -2*x^2-15*x+11= equation:


Simplifying
-2x2 + -15x + 11 = 0

Reorder the terms:
11 + -15x + -2x2 = 0

Solving
11 + -15x + -2x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
-5.5 + 7.5x + x2 = 0

Move the constant term to the right:

Add '5.5' to each side of the equation.
-5.5 + 7.5x + 5.5 + x2 = 0 + 5.5

Reorder the terms:
-5.5 + 5.5 + 7.5x + x2 = 0 + 5.5

Combine like terms: -5.5 + 5.5 = 0.0
0.0 + 7.5x + x2 = 0 + 5.5
7.5x + x2 = 0 + 5.5

Combine like terms: 0 + 5.5 = 5.5
7.5x + x2 = 5.5

The x term is 7.5x.  Take half its coefficient (3.75).
Square it (14.0625) and add it to both sides.

Add '14.0625' to each side of the equation.
7.5x + 14.0625 + x2 = 5.5 + 14.0625

Reorder the terms:
14.0625 + 7.5x + x2 = 5.5 + 14.0625

Combine like terms: 5.5 + 14.0625 = 19.5625
14.0625 + 7.5x + x2 = 19.5625

Factor a perfect square on the left side:
(x + 3.75)(x + 3.75) = 19.5625

Calculate the square root of the right side: 4.422951503

Break this problem into two subproblems by setting 
(x + 3.75) equal to 4.422951503 and -4.422951503.

Subproblem 1

x + 3.75 = 4.422951503 Simplifying x + 3.75 = 4.422951503 Reorder the terms: 3.75 + x = 4.422951503 Solving 3.75 + x = 4.422951503 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.75' to each side of the equation. 3.75 + -3.75 + x = 4.422951503 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + x = 4.422951503 + -3.75 x = 4.422951503 + -3.75 Combine like terms: 4.422951503 + -3.75 = 0.672951503 x = 0.672951503 Simplifying x = 0.672951503

Subproblem 2

x + 3.75 = -4.422951503 Simplifying x + 3.75 = -4.422951503 Reorder the terms: 3.75 + x = -4.422951503 Solving 3.75 + x = -4.422951503 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.75' to each side of the equation. 3.75 + -3.75 + x = -4.422951503 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + x = -4.422951503 + -3.75 x = -4.422951503 + -3.75 Combine like terms: -4.422951503 + -3.75 = -8.172951503 x = -8.172951503 Simplifying x = -8.172951503

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.672951503, -8.172951503}

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