-16x^2+80x=5

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Solution for -16x^2+80x=5 equation:


Simplifying
-16x2 + 80x = 5

Reorder the terms:
80x + -16x2 = 5

Solving
80x + -16x2 = 5

Solving for variable 'x'.

Reorder the terms:
-5 + 80x + -16x2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + 80x + -16x2 = 0

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

Divide each side by '-16'.
0.3125 + -5x + x2 = 0

Move the constant term to the right:

Add '-0.3125' to each side of the equation.
0.3125 + -5x + -0.3125 + x2 = 0 + -0.3125

Reorder the terms:
0.3125 + -0.3125 + -5x + x2 = 0 + -0.3125

Combine like terms: 0.3125 + -0.3125 = 0.0000
0.0000 + -5x + x2 = 0 + -0.3125
-5x + x2 = 0 + -0.3125

Combine like terms: 0 + -0.3125 = -0.3125
-5x + x2 = -0.3125

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = -0.3125 + 6.25

Reorder the terms:
6.25 + -5x + x2 = -0.3125 + 6.25

Combine like terms: -0.3125 + 6.25 = 5.9375
6.25 + -5x + x2 = 5.9375

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 5.9375

Calculate the square root of the right side: 2.436698586

Break this problem into two subproblems by setting 
(x + -2.5) equal to 2.436698586 and -2.436698586.

Subproblem 1

x + -2.5 = 2.436698586 Simplifying x + -2.5 = 2.436698586 Reorder the terms: -2.5 + x = 2.436698586 Solving -2.5 + x = 2.436698586 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 2.436698586 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 2.436698586 + 2.5 x = 2.436698586 + 2.5 Combine like terms: 2.436698586 + 2.5 = 4.936698586 x = 4.936698586 Simplifying x = 4.936698586

Subproblem 2

x + -2.5 = -2.436698586 Simplifying x + -2.5 = -2.436698586 Reorder the terms: -2.5 + x = -2.436698586 Solving -2.5 + x = -2.436698586 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -2.436698586 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -2.436698586 + 2.5 x = -2.436698586 + 2.5 Combine like terms: -2.436698586 + 2.5 = 0.063301414 x = 0.063301414 Simplifying x = 0.063301414

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.936698586, 0.063301414}

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