16x^2-10x-15=0

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Solution for 16x^2-10x-15=0 equation:


Simplifying
16x2 + -10x + -15 = 0

Reorder the terms:
-15 + -10x + 16x2 = 0

Solving
-15 + -10x + 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 + -0.625x + x2 = 0

Move the constant term to the right:

Add '0.9375' to each side of the equation.
-0.9375 + -0.625x + 0.9375 + x2 = 0 + 0.9375

Reorder the terms:
-0.9375 + 0.9375 + -0.625x + x2 = 0 + 0.9375

Combine like terms: -0.9375 + 0.9375 = 0.0000
0.0000 + -0.625x + x2 = 0 + 0.9375
-0.625x + x2 = 0 + 0.9375

Combine like terms: 0 + 0.9375 = 0.9375
-0.625x + x2 = 0.9375

The x term is -0.625x.  Take half its coefficient (-0.3125).
Square it (0.09765625) and add it to both sides.

Add '0.09765625' to each side of the equation.
-0.625x + 0.09765625 + x2 = 0.9375 + 0.09765625

Reorder the terms:
0.09765625 + -0.625x + x2 = 0.9375 + 0.09765625

Combine like terms: 0.9375 + 0.09765625 = 1.03515625
0.09765625 + -0.625x + x2 = 1.03515625

Factor a perfect square on the left side:
(x + -0.3125)(x + -0.3125) = 1.03515625

Calculate the square root of the right side: 1.017426287

Break this problem into two subproblems by setting 
(x + -0.3125) equal to 1.017426287 and -1.017426287.

Subproblem 1

x + -0.3125 = 1.017426287 Simplifying x + -0.3125 = 1.017426287 Reorder the terms: -0.3125 + x = 1.017426287 Solving -0.3125 + x = 1.017426287 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + x = 1.017426287 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + x = 1.017426287 + 0.3125 x = 1.017426287 + 0.3125 Combine like terms: 1.017426287 + 0.3125 = 1.329926287 x = 1.329926287 Simplifying x = 1.329926287

Subproblem 2

x + -0.3125 = -1.017426287 Simplifying x + -0.3125 = -1.017426287 Reorder the terms: -0.3125 + x = -1.017426287 Solving -0.3125 + x = -1.017426287 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + x = -1.017426287 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + x = -1.017426287 + 0.3125 x = -1.017426287 + 0.3125 Combine like terms: -1.017426287 + 0.3125 = -0.704926287 x = -0.704926287 Simplifying x = -0.704926287

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.329926287, -0.704926287}

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