-16x^2+48x+129=0

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Solution for -16x^2+48x+129=0 equation:


Simplifying
-16x2 + 48x + 129 = 0

Reorder the terms:
129 + 48x + -16x2 = 0

Solving
129 + 48x + -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'.
-8.0625 + -3x + x2 = 0

Move the constant term to the right:

Add '8.0625' to each side of the equation.
-8.0625 + -3x + 8.0625 + x2 = 0 + 8.0625

Reorder the terms:
-8.0625 + 8.0625 + -3x + x2 = 0 + 8.0625

Combine like terms: -8.0625 + 8.0625 = 0.0000
0.0000 + -3x + x2 = 0 + 8.0625
-3x + x2 = 0 + 8.0625

Combine like terms: 0 + 8.0625 = 8.0625
-3x + x2 = 8.0625

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 8.0625 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 8.0625 + 2.25

Combine like terms: 8.0625 + 2.25 = 10.3125
2.25 + -3x + x2 = 10.3125

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 10.3125

Calculate the square root of the right side: 3.211308145

Break this problem into two subproblems by setting 
(x + -1.5) equal to 3.211308145 and -3.211308145.

Subproblem 1

x + -1.5 = 3.211308145 Simplifying x + -1.5 = 3.211308145 Reorder the terms: -1.5 + x = 3.211308145 Solving -1.5 + x = 3.211308145 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 3.211308145 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 3.211308145 + 1.5 x = 3.211308145 + 1.5 Combine like terms: 3.211308145 + 1.5 = 4.711308145 x = 4.711308145 Simplifying x = 4.711308145

Subproblem 2

x + -1.5 = -3.211308145 Simplifying x + -1.5 = -3.211308145 Reorder the terms: -1.5 + x = -3.211308145 Solving -1.5 + x = -3.211308145 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -3.211308145 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -3.211308145 + 1.5 x = -3.211308145 + 1.5 Combine like terms: -3.211308145 + 1.5 = -1.711308145 x = -1.711308145 Simplifying x = -1.711308145

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.711308145, -1.711308145}

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