236-15x-2x^2=0

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Solution for 236-15x-2x^2=0 equation:


Simplifying
236 + -15x + -2x2 = 0

Solving
236 + -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'.
-118 + 7.5x + x2 = 0

Move the constant term to the right:

Add '118' to each side of the equation.
-118 + 7.5x + 118 + x2 = 0 + 118

Reorder the terms:
-118 + 118 + 7.5x + x2 = 0 + 118

Combine like terms: -118 + 118 = 0
0 + 7.5x + x2 = 0 + 118
7.5x + x2 = 0 + 118

Combine like terms: 0 + 118 = 118
7.5x + x2 = 118

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 = 118 + 14.0625

Reorder the terms:
14.0625 + 7.5x + x2 = 118 + 14.0625

Combine like terms: 118 + 14.0625 = 132.0625
14.0625 + 7.5x + x2 = 132.0625

Factor a perfect square on the left side:
(x + 3.75)(x + 3.75) = 132.0625

Calculate the square root of the right side: 11.491844935

Break this problem into two subproblems by setting 
(x + 3.75) equal to 11.491844935 and -11.491844935.

Subproblem 1

x + 3.75 = 11.491844935 Simplifying x + 3.75 = 11.491844935 Reorder the terms: 3.75 + x = 11.491844935 Solving 3.75 + x = 11.491844935 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 = 11.491844935 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + x = 11.491844935 + -3.75 x = 11.491844935 + -3.75 Combine like terms: 11.491844935 + -3.75 = 7.741844935 x = 7.741844935 Simplifying x = 7.741844935

Subproblem 2

x + 3.75 = -11.491844935 Simplifying x + 3.75 = -11.491844935 Reorder the terms: 3.75 + x = -11.491844935 Solving 3.75 + x = -11.491844935 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 = -11.491844935 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + x = -11.491844935 + -3.75 x = -11.491844935 + -3.75 Combine like terms: -11.491844935 + -3.75 = -15.241844935 x = -15.241844935 Simplifying x = -15.241844935

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.741844935, -15.241844935}

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