5+20x-16x^2=0

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Solution for 5+20x-16x^2=0 equation:


Simplifying
5 + 20x + -16x2 = 0

Solving
5 + 20x + -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'.
-0.3125 + -1.25x + x2 = 0

Move the constant term to the right:

Add '0.3125' to each side of the equation.
-0.3125 + -1.25x + 0.3125 + x2 = 0 + 0.3125

Reorder the terms:
-0.3125 + 0.3125 + -1.25x + x2 = 0 + 0.3125

Combine like terms: -0.3125 + 0.3125 = 0.0000
0.0000 + -1.25x + x2 = 0 + 0.3125
-1.25x + x2 = 0 + 0.3125

Combine like terms: 0 + 0.3125 = 0.3125
-1.25x + x2 = 0.3125

The x term is -1.25x.  Take half its coefficient (-0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
-1.25x + 0.390625 + x2 = 0.3125 + 0.390625

Reorder the terms:
0.390625 + -1.25x + x2 = 0.3125 + 0.390625

Combine like terms: 0.3125 + 0.390625 = 0.703125
0.390625 + -1.25x + x2 = 0.703125

Factor a perfect square on the left side:
(x + -0.625)(x + -0.625) = 0.703125

Calculate the square root of the right side: 0.838525492

Break this problem into two subproblems by setting 
(x + -0.625) equal to 0.838525492 and -0.838525492.

Subproblem 1

x + -0.625 = 0.838525492 Simplifying x + -0.625 = 0.838525492 Reorder the terms: -0.625 + x = 0.838525492 Solving -0.625 + x = 0.838525492 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + x = 0.838525492 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = 0.838525492 + 0.625 x = 0.838525492 + 0.625 Combine like terms: 0.838525492 + 0.625 = 1.463525492 x = 1.463525492 Simplifying x = 1.463525492

Subproblem 2

x + -0.625 = -0.838525492 Simplifying x + -0.625 = -0.838525492 Reorder the terms: -0.625 + x = -0.838525492 Solving -0.625 + x = -0.838525492 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + x = -0.838525492 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = -0.838525492 + 0.625 x = -0.838525492 + 0.625 Combine like terms: -0.838525492 + 0.625 = -0.213525492 x = -0.213525492 Simplifying x = -0.213525492

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.463525492, -0.213525492}

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