2x^2-3x-11=6

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Solution for 2x^2-3x-11=6 equation:


Simplifying
2x2 + -3x + -11 = 6

Reorder the terms:
-11 + -3x + 2x2 = 6

Solving
-11 + -3x + 2x2 = 6

Solving for variable 'x'.

Reorder the terms:
-11 + -6 + -3x + 2x2 = 6 + -6

Combine like terms: -11 + -6 = -17
-17 + -3x + 2x2 = 6 + -6

Combine like terms: 6 + -6 = 0
-17 + -3x + 2x2 = 0

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

Divide each side by '2'.
-8.5 + -1.5x + x2 = 0

Move the constant term to the right:

Add '8.5' to each side of the equation.
-8.5 + -1.5x + 8.5 + x2 = 0 + 8.5

Reorder the terms:
-8.5 + 8.5 + -1.5x + x2 = 0 + 8.5

Combine like terms: -8.5 + 8.5 = 0.0
0.0 + -1.5x + x2 = 0 + 8.5
-1.5x + x2 = 0 + 8.5

Combine like terms: 0 + 8.5 = 8.5
-1.5x + x2 = 8.5

The x term is -1.5x.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5x + 0.5625 + x2 = 8.5 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = 8.5 + 0.5625

Combine like terms: 8.5 + 0.5625 = 9.0625
0.5625 + -1.5x + x2 = 9.0625

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 9.0625

Calculate the square root of the right side: 3.010398645

Break this problem into two subproblems by setting 
(x + -0.75) equal to 3.010398645 and -3.010398645.

Subproblem 1

x + -0.75 = 3.010398645 Simplifying x + -0.75 = 3.010398645 Reorder the terms: -0.75 + x = 3.010398645 Solving -0.75 + x = 3.010398645 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = 3.010398645 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = 3.010398645 + 0.75 x = 3.010398645 + 0.75 Combine like terms: 3.010398645 + 0.75 = 3.760398645 x = 3.760398645 Simplifying x = 3.760398645

Subproblem 2

x + -0.75 = -3.010398645 Simplifying x + -0.75 = -3.010398645 Reorder the terms: -0.75 + x = -3.010398645 Solving -0.75 + x = -3.010398645 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = -3.010398645 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = -3.010398645 + 0.75 x = -3.010398645 + 0.75 Combine like terms: -3.010398645 + 0.75 = -2.260398645 x = -2.260398645 Simplifying x = -2.260398645

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.760398645, -2.260398645}

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