0=-16x^2+35x+6.5

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Solution for 0=-16x^2+35x+6.5 equation:


Simplifying
0 = -16x2 + 35x + 6.5

Reorder the terms:
0 = 6.5 + 35x + -16x2

Solving
0 = 6.5 + 35x + -16x2

Solving for variable 'x'.

Combine like terms: 0 + -6.5 = -6.5
-6.5 + -35x + 16x2 = 6.5 + 35x + -16x2 + -6.5 + -35x + 16x2

Reorder the terms:
-6.5 + -35x + 16x2 = 6.5 + -6.5 + 35x + -35x + -16x2 + 16x2

Combine like terms: 6.5 + -6.5 = 0.0
-6.5 + -35x + 16x2 = 0.0 + 35x + -35x + -16x2 + 16x2
-6.5 + -35x + 16x2 = 35x + -35x + -16x2 + 16x2

Combine like terms: 35x + -35x = 0
-6.5 + -35x + 16x2 = 0 + -16x2 + 16x2
-6.5 + -35x + 16x2 = -16x2 + 16x2

Combine like terms: -16x2 + 16x2 = 0
-6.5 + -35x + 16x2 = 0

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

Divide each side by '16'.
-0.40625 + -2.1875x + x2 = 0

Move the constant term to the right:

Add '0.40625' to each side of the equation.
-0.40625 + -2.1875x + 0.40625 + x2 = 0 + 0.40625

Reorder the terms:
-0.40625 + 0.40625 + -2.1875x + x2 = 0 + 0.40625

Combine like terms: -0.40625 + 0.40625 = 0.00000
0.00000 + -2.1875x + x2 = 0 + 0.40625
-2.1875x + x2 = 0 + 0.40625

Combine like terms: 0 + 0.40625 = 0.40625
-2.1875x + x2 = 0.40625

The x term is -2.1875x.  Take half its coefficient (-1.09375).
Square it (1.196289063) and add it to both sides.

Add '1.196289063' to each side of the equation.
-2.1875x + 1.196289063 + x2 = 0.40625 + 1.196289063

Reorder the terms:
1.196289063 + -2.1875x + x2 = 0.40625 + 1.196289063

Combine like terms: 0.40625 + 1.196289063 = 1.602539063
1.196289063 + -2.1875x + x2 = 1.602539063

Factor a perfect square on the left side:
(x + -1.09375)(x + -1.09375) = 1.602539063

Calculate the square root of the right side: 1.265914319

Break this problem into two subproblems by setting 
(x + -1.09375) equal to 1.265914319 and -1.265914319.

Subproblem 1

x + -1.09375 = 1.265914319 Simplifying x + -1.09375 = 1.265914319 Reorder the terms: -1.09375 + x = 1.265914319 Solving -1.09375 + x = 1.265914319 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.09375' to each side of the equation. -1.09375 + 1.09375 + x = 1.265914319 + 1.09375 Combine like terms: -1.09375 + 1.09375 = 0.00000 0.00000 + x = 1.265914319 + 1.09375 x = 1.265914319 + 1.09375 Combine like terms: 1.265914319 + 1.09375 = 2.359664319 x = 2.359664319 Simplifying x = 2.359664319

Subproblem 2

x + -1.09375 = -1.265914319 Simplifying x + -1.09375 = -1.265914319 Reorder the terms: -1.09375 + x = -1.265914319 Solving -1.09375 + x = -1.265914319 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.09375' to each side of the equation. -1.09375 + 1.09375 + x = -1.265914319 + 1.09375 Combine like terms: -1.09375 + 1.09375 = 0.00000 0.00000 + x = -1.265914319 + 1.09375 x = -1.265914319 + 1.09375 Combine like terms: -1.265914319 + 1.09375 = -0.172164319 x = -0.172164319 Simplifying x = -0.172164319

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.359664319, -0.172164319}

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