(2x^2)-15x-1=0

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Solution for (2x^2)-15x-1=0 equation:


Simplifying
(2x2) + -15x + -1 = 0

Reorder the terms:
-1 + -15x + (2x2) = 0

Solving
-1 + -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'.
-0.5 + -7.5x + x2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + -7.5x + 0.5 + x2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + -7.5x + x2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + -7.5x + x2 = 0 + 0.5
-7.5x + x2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
-7.5x + x2 = 0.5

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 = 0.5 + 14.0625

Reorder the terms:
14.0625 + -7.5x + x2 = 0.5 + 14.0625

Combine like terms: 0.5 + 14.0625 = 14.5625
14.0625 + -7.5x + x2 = 14.5625

Factor a perfect square on the left side:
((x) + -3.75)((x) + -3.75) = 14.5625

Calculate the square root of the right side: 3.816084381

Break this problem into two subproblems by setting 
((x) + -3.75) equal to 3.816084381 and -3.816084381.

Subproblem 1

(x) + -3.75 = 3.816084381 Simplifying (x) + -3.75 = 3.816084381 x + -3.75 = 3.816084381 Reorder the terms: -3.75 + x = 3.816084381 Solving -3.75 + x = 3.816084381 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 = 3.816084381 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + x = 3.816084381 + 3.75 x = 3.816084381 + 3.75 Combine like terms: 3.816084381 + 3.75 = 7.566084381 x = 7.566084381 Simplifying x = 7.566084381

Subproblem 2

(x) + -3.75 = -3.816084381 Simplifying (x) + -3.75 = -3.816084381 x + -3.75 = -3.816084381 Reorder the terms: -3.75 + x = -3.816084381 Solving -3.75 + x = -3.816084381 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 = -3.816084381 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + x = -3.816084381 + 3.75 x = -3.816084381 + 3.75 Combine like terms: -3.816084381 + 3.75 = -0.066084381 x = -0.066084381 Simplifying x = -0.066084381

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.566084381, -0.066084381}

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