2x^2-8x-165=0

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Solution for 2x^2-8x-165=0 equation:


Simplifying
2x2 + -8x + -165 = 0

Reorder the terms:
-165 + -8x + 2x2 = 0

Solving
-165 + -8x + 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'.
-82.5 + -4x + x2 = 0

Move the constant term to the right:

Add '82.5' to each side of the equation.
-82.5 + -4x + 82.5 + x2 = 0 + 82.5

Reorder the terms:
-82.5 + 82.5 + -4x + x2 = 0 + 82.5

Combine like terms: -82.5 + 82.5 = 0.0
0.0 + -4x + x2 = 0 + 82.5
-4x + x2 = 0 + 82.5

Combine like terms: 0 + 82.5 = 82.5
-4x + x2 = 82.5

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 82.5 + 4

Reorder the terms:
4 + -4x + x2 = 82.5 + 4

Combine like terms: 82.5 + 4 = 86.5
4 + -4x + x2 = 86.5

Factor a perfect square on the left side:
(x + -2)(x + -2) = 86.5

Calculate the square root of the right side: 9.300537619

Break this problem into two subproblems by setting 
(x + -2) equal to 9.300537619 and -9.300537619.

Subproblem 1

x + -2 = 9.300537619 Simplifying x + -2 = 9.300537619 Reorder the terms: -2 + x = 9.300537619 Solving -2 + x = 9.300537619 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 9.300537619 + 2 Combine like terms: -2 + 2 = 0 0 + x = 9.300537619 + 2 x = 9.300537619 + 2 Combine like terms: 9.300537619 + 2 = 11.300537619 x = 11.300537619 Simplifying x = 11.300537619

Subproblem 2

x + -2 = -9.300537619 Simplifying x + -2 = -9.300537619 Reorder the terms: -2 + x = -9.300537619 Solving -2 + x = -9.300537619 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -9.300537619 + 2 Combine like terms: -2 + 2 = 0 0 + x = -9.300537619 + 2 x = -9.300537619 + 2 Combine like terms: -9.300537619 + 2 = -7.300537619 x = -7.300537619 Simplifying x = -7.300537619

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.300537619, -7.300537619}

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