-16x^2+128x+389=0

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Solution for -16x^2+128x+389=0 equation:


Simplifying
-16x2 + 128x + 389 = 0

Reorder the terms:
389 + 128x + -16x2 = 0

Solving
389 + 128x + -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'.
-24.3125 + -8x + x2 = 0

Move the constant term to the right:

Add '24.3125' to each side of the equation.
-24.3125 + -8x + 24.3125 + x2 = 0 + 24.3125

Reorder the terms:
-24.3125 + 24.3125 + -8x + x2 = 0 + 24.3125

Combine like terms: -24.3125 + 24.3125 = 0.0000
0.0000 + -8x + x2 = 0 + 24.3125
-8x + x2 = 0 + 24.3125

Combine like terms: 0 + 24.3125 = 24.3125
-8x + x2 = 24.3125

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = 24.3125 + 16

Reorder the terms:
16 + -8x + x2 = 24.3125 + 16

Combine like terms: 24.3125 + 16 = 40.3125
16 + -8x + x2 = 40.3125

Factor a perfect square on the left side:
(x + -4)(x + -4) = 40.3125

Calculate the square root of the right side: 6.34921255

Break this problem into two subproblems by setting 
(x + -4) equal to 6.34921255 and -6.34921255.

Subproblem 1

x + -4 = 6.34921255 Simplifying x + -4 = 6.34921255 Reorder the terms: -4 + x = 6.34921255 Solving -4 + x = 6.34921255 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 6.34921255 + 4 Combine like terms: -4 + 4 = 0 0 + x = 6.34921255 + 4 x = 6.34921255 + 4 Combine like terms: 6.34921255 + 4 = 10.34921255 x = 10.34921255 Simplifying x = 10.34921255

Subproblem 2

x + -4 = -6.34921255 Simplifying x + -4 = -6.34921255 Reorder the terms: -4 + x = -6.34921255 Solving -4 + x = -6.34921255 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -6.34921255 + 4 Combine like terms: -4 + 4 = 0 0 + x = -6.34921255 + 4 x = -6.34921255 + 4 Combine like terms: -6.34921255 + 4 = -2.34921255 x = -2.34921255 Simplifying x = -2.34921255

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.34921255, -2.34921255}

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