0=-16x^2+155x-9

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Solution for 0=-16x^2+155x-9 equation:


Simplifying
0 = -16x2 + 155x + -9

Reorder the terms:
0 = -9 + 155x + -16x2

Solving
0 = -9 + 155x + -16x2

Solving for variable 'x'.

Combine like terms: 0 + 9 = 9
9 + -155x + 16x2 = -9 + 155x + -16x2 + 9 + -155x + 16x2

Reorder the terms:
9 + -155x + 16x2 = -9 + 9 + 155x + -155x + -16x2 + 16x2

Combine like terms: -9 + 9 = 0
9 + -155x + 16x2 = 0 + 155x + -155x + -16x2 + 16x2
9 + -155x + 16x2 = 155x + -155x + -16x2 + 16x2

Combine like terms: 155x + -155x = 0
9 + -155x + 16x2 = 0 + -16x2 + 16x2
9 + -155x + 16x2 = -16x2 + 16x2

Combine like terms: -16x2 + 16x2 = 0
9 + -155x + 16x2 = 0

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

Divide each side by '16'.
0.5625 + -9.6875x + x2 = 0

Move the constant term to the right:

Add '-0.5625' to each side of the equation.
0.5625 + -9.6875x + -0.5625 + x2 = 0 + -0.5625

Reorder the terms:
0.5625 + -0.5625 + -9.6875x + x2 = 0 + -0.5625

Combine like terms: 0.5625 + -0.5625 = 0.0000
0.0000 + -9.6875x + x2 = 0 + -0.5625
-9.6875x + x2 = 0 + -0.5625

Combine like terms: 0 + -0.5625 = -0.5625
-9.6875x + x2 = -0.5625

The x term is -9.6875x.  Take half its coefficient (-4.84375).
Square it (23.46191406) and add it to both sides.

Add '23.46191406' to each side of the equation.
-9.6875x + 23.46191406 + x2 = -0.5625 + 23.46191406

Reorder the terms:
23.46191406 + -9.6875x + x2 = -0.5625 + 23.46191406

Combine like terms: -0.5625 + 23.46191406 = 22.89941406
23.46191406 + -9.6875x + x2 = 22.89941406

Factor a perfect square on the left side:
(x + -4.84375)(x + -4.84375) = 22.89941406

Calculate the square root of the right side: 4.785333224

Break this problem into two subproblems by setting 
(x + -4.84375) equal to 4.785333224 and -4.785333224.

Subproblem 1

x + -4.84375 = 4.785333224 Simplifying x + -4.84375 = 4.785333224 Reorder the terms: -4.84375 + x = 4.785333224 Solving -4.84375 + x = 4.785333224 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.84375' to each side of the equation. -4.84375 + 4.84375 + x = 4.785333224 + 4.84375 Combine like terms: -4.84375 + 4.84375 = 0.00000 0.00000 + x = 4.785333224 + 4.84375 x = 4.785333224 + 4.84375 Combine like terms: 4.785333224 + 4.84375 = 9.629083224 x = 9.629083224 Simplifying x = 9.629083224

Subproblem 2

x + -4.84375 = -4.785333224 Simplifying x + -4.84375 = -4.785333224 Reorder the terms: -4.84375 + x = -4.785333224 Solving -4.84375 + x = -4.785333224 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.84375' to each side of the equation. -4.84375 + 4.84375 + x = -4.785333224 + 4.84375 Combine like terms: -4.84375 + 4.84375 = 0.00000 0.00000 + x = -4.785333224 + 4.84375 x = -4.785333224 + 4.84375 Combine like terms: -4.785333224 + 4.84375 = 0.058416776 x = 0.058416776 Simplifying x = 0.058416776

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.629083224, 0.058416776}

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