-16x^2-12x+15=0

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Solution for -16x^2-12x+15=0 equation:


Simplifying
-16x2 + -12x + 15 = 0

Reorder the terms:
15 + -12x + -16x2 = 0

Solving
15 + -12x + -16x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-16 the coefficient of the squared term: 

Divide each side by '-16'.
-0.9375 + 0.75x + x2 = 0

Move the constant term to the right:

Add '0.9375' to each side of the equation.
-0.9375 + 0.75x + 0.9375 + x2 = 0 + 0.9375

Reorder the terms:
-0.9375 + 0.9375 + 0.75x + x2 = 0 + 0.9375

Combine like terms: -0.9375 + 0.9375 = 0.0000
0.0000 + 0.75x + x2 = 0 + 0.9375
0.75x + x2 = 0 + 0.9375

Combine like terms: 0 + 0.9375 = 0.9375
0.75x + x2 = 0.9375

The x term is 0.75x.  Take half its coefficient (0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
0.75x + 0.140625 + x2 = 0.9375 + 0.140625

Reorder the terms:
0.140625 + 0.75x + x2 = 0.9375 + 0.140625

Combine like terms: 0.9375 + 0.140625 = 1.078125
0.140625 + 0.75x + x2 = 1.078125

Factor a perfect square on the left side:
(x + 0.375)(x + 0.375) = 1.078125

Calculate the square root of the right side: 1.038327983

Break this problem into two subproblems by setting 
(x + 0.375) equal to 1.038327983 and -1.038327983.

Subproblem 1

x + 0.375 = 1.038327983 Simplifying x + 0.375 = 1.038327983 Reorder the terms: 0.375 + x = 1.038327983 Solving 0.375 + x = 1.038327983 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = 1.038327983 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = 1.038327983 + -0.375 x = 1.038327983 + -0.375 Combine like terms: 1.038327983 + -0.375 = 0.663327983 x = 0.663327983 Simplifying x = 0.663327983

Subproblem 2

x + 0.375 = -1.038327983 Simplifying x + 0.375 = -1.038327983 Reorder the terms: 0.375 + x = -1.038327983 Solving 0.375 + x = -1.038327983 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = -1.038327983 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = -1.038327983 + -0.375 x = -1.038327983 + -0.375 Combine like terms: -1.038327983 + -0.375 = -1.413327983 x = -1.413327983 Simplifying x = -1.413327983

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.663327983, -1.413327983}

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