-16x^2=8x-5

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Solution for -16x^2=8x-5 equation:


Simplifying
-16x2 = 8x + -5

Reorder the terms:
-16x2 = -5 + 8x

Solving
-16x2 = -5 + 8x

Solving for variable 'x'.

Reorder the terms:
5 + -8x + -16x2 = -5 + 8x + 5 + -8x

Reorder the terms:
5 + -8x + -16x2 = -5 + 5 + 8x + -8x

Combine like terms: -5 + 5 = 0
5 + -8x + -16x2 = 0 + 8x + -8x
5 + -8x + -16x2 = 8x + -8x

Combine like terms: 8x + -8x = 0
5 + -8x + -16x2 = 0

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

Divide each side by '-16'.
-0.3125 + 0.5x + x2 = 0

Move the constant term to the right:

Add '0.3125' to each side of the equation.
-0.3125 + 0.5x + 0.3125 + x2 = 0 + 0.3125

Reorder the terms:
-0.3125 + 0.3125 + 0.5x + x2 = 0 + 0.3125

Combine like terms: -0.3125 + 0.3125 = 0.0000
0.0000 + 0.5x + x2 = 0 + 0.3125
0.5x + x2 = 0 + 0.3125

Combine like terms: 0 + 0.3125 = 0.3125
0.5x + x2 = 0.3125

The x term is 0.5x.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5x + 0.0625 + x2 = 0.3125 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 0.3125 + 0.0625

Combine like terms: 0.3125 + 0.0625 = 0.375
0.0625 + 0.5x + x2 = 0.375

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 0.375

Calculate the square root of the right side: 0.612372436

Break this problem into two subproblems by setting 
(x + 0.25) equal to 0.612372436 and -0.612372436.

Subproblem 1

x + 0.25 = 0.612372436 Simplifying x + 0.25 = 0.612372436 Reorder the terms: 0.25 + x = 0.612372436 Solving 0.25 + x = 0.612372436 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = 0.612372436 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 0.612372436 + -0.25 x = 0.612372436 + -0.25 Combine like terms: 0.612372436 + -0.25 = 0.362372436 x = 0.362372436 Simplifying x = 0.362372436

Subproblem 2

x + 0.25 = -0.612372436 Simplifying x + 0.25 = -0.612372436 Reorder the terms: 0.25 + x = -0.612372436 Solving 0.25 + x = -0.612372436 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = -0.612372436 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -0.612372436 + -0.25 x = -0.612372436 + -0.25 Combine like terms: -0.612372436 + -0.25 = -0.862372436 x = -0.862372436 Simplifying x = -0.862372436

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.362372436, -0.862372436}

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