53=2x^2-15x-36

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Solution for 53=2x^2-15x-36 equation:


Simplifying
53 = 2x2 + -15x + -36

Reorder the terms:
53 = -36 + -15x + 2x2

Solving
53 = -36 + -15x + 2x2

Solving for variable 'x'.

Combine like terms: 53 + 36 = 89
89 + 15x + -2x2 = -36 + -15x + 2x2 + 36 + 15x + -2x2

Reorder the terms:
89 + 15x + -2x2 = -36 + 36 + -15x + 15x + 2x2 + -2x2

Combine like terms: -36 + 36 = 0
89 + 15x + -2x2 = 0 + -15x + 15x + 2x2 + -2x2
89 + 15x + -2x2 = -15x + 15x + 2x2 + -2x2

Combine like terms: -15x + 15x = 0
89 + 15x + -2x2 = 0 + 2x2 + -2x2
89 + 15x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
89 + 15x + -2x2 = 0

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

Divide each side by '-2'.
-44.5 + -7.5x + x2 = 0

Move the constant term to the right:

Add '44.5' to each side of the equation.
-44.5 + -7.5x + 44.5 + x2 = 0 + 44.5

Reorder the terms:
-44.5 + 44.5 + -7.5x + x2 = 0 + 44.5

Combine like terms: -44.5 + 44.5 = 0.0
0.0 + -7.5x + x2 = 0 + 44.5
-7.5x + x2 = 0 + 44.5

Combine like terms: 0 + 44.5 = 44.5
-7.5x + x2 = 44.5

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 = 44.5 + 14.0625

Reorder the terms:
14.0625 + -7.5x + x2 = 44.5 + 14.0625

Combine like terms: 44.5 + 14.0625 = 58.5625
14.0625 + -7.5x + x2 = 58.5625

Factor a perfect square on the left side:
(x + -3.75)(x + -3.75) = 58.5625

Calculate the square root of the right side: 7.652613933

Break this problem into two subproblems by setting 
(x + -3.75) equal to 7.652613933 and -7.652613933.

Subproblem 1

x + -3.75 = 7.652613933 Simplifying x + -3.75 = 7.652613933 Reorder the terms: -3.75 + x = 7.652613933 Solving -3.75 + x = 7.652613933 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 = 7.652613933 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + x = 7.652613933 + 3.75 x = 7.652613933 + 3.75 Combine like terms: 7.652613933 + 3.75 = 11.402613933 x = 11.402613933 Simplifying x = 11.402613933

Subproblem 2

x + -3.75 = -7.652613933 Simplifying x + -3.75 = -7.652613933 Reorder the terms: -3.75 + x = -7.652613933 Solving -3.75 + x = -7.652613933 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 = -7.652613933 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + x = -7.652613933 + 3.75 x = -7.652613933 + 3.75 Combine like terms: -7.652613933 + 3.75 = -3.902613933 x = -3.902613933 Simplifying x = -3.902613933

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.402613933, -3.902613933}

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