-16x^2-2.5x+3=0

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Solution for -16x^2-2.5x+3=0 equation:


Simplifying
-16x2 + -2.5x + 3 = 0

Reorder the terms:
3 + -2.5x + -16x2 = 0

Solving
3 + -2.5x + -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'.
-0.1875 + 0.15625x + x2 = 0

Move the constant term to the right:

Add '0.1875' to each side of the equation.
-0.1875 + 0.15625x + 0.1875 + x2 = 0 + 0.1875

Reorder the terms:
-0.1875 + 0.1875 + 0.15625x + x2 = 0 + 0.1875

Combine like terms: -0.1875 + 0.1875 = 0.0000
0.0000 + 0.15625x + x2 = 0 + 0.1875
0.15625x + x2 = 0 + 0.1875

Combine like terms: 0 + 0.1875 = 0.1875
0.15625x + x2 = 0.1875

The x term is 0.15625x.  Take half its coefficient (0.078125).
Square it (0.006103515625) and add it to both sides.

Add '0.006103515625' to each side of the equation.
0.15625x + 0.006103515625 + x2 = 0.1875 + 0.006103515625

Reorder the terms:
0.006103515625 + 0.15625x + x2 = 0.1875 + 0.006103515625

Combine like terms: 0.1875 + 0.006103515625 = 0.193603515625
0.006103515625 + 0.15625x + x2 = 0.193603515625

Factor a perfect square on the left side:
(x + 0.078125)(x + 0.078125) = 0.193603515625

Calculate the square root of the right side: 0.440003995

Break this problem into two subproblems by setting 
(x + 0.078125) equal to 0.440003995 and -0.440003995.

Subproblem 1

x + 0.078125 = 0.440003995 Simplifying x + 0.078125 = 0.440003995 Reorder the terms: 0.078125 + x = 0.440003995 Solving 0.078125 + x = 0.440003995 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.078125' to each side of the equation. 0.078125 + -0.078125 + x = 0.440003995 + -0.078125 Combine like terms: 0.078125 + -0.078125 = 0.000000 0.000000 + x = 0.440003995 + -0.078125 x = 0.440003995 + -0.078125 Combine like terms: 0.440003995 + -0.078125 = 0.361878995 x = 0.361878995 Simplifying x = 0.361878995

Subproblem 2

x + 0.078125 = -0.440003995 Simplifying x + 0.078125 = -0.440003995 Reorder the terms: 0.078125 + x = -0.440003995 Solving 0.078125 + x = -0.440003995 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.078125' to each side of the equation. 0.078125 + -0.078125 + x = -0.440003995 + -0.078125 Combine like terms: 0.078125 + -0.078125 = 0.000000 0.000000 + x = -0.440003995 + -0.078125 x = -0.440003995 + -0.078125 Combine like terms: -0.440003995 + -0.078125 = -0.518128995 x = -0.518128995 Simplifying x = -0.518128995

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.361878995, -0.518128995}

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