0=-.08x^2+1.6x+2

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Solution for 0=-.08x^2+1.6x+2 equation:


Simplifying
0 = -0.08x2 + 1.6x + 2

Reorder the terms:
0 = 2 + 1.6x + -0.08x2

Solving
0 = 2 + 1.6x + -0.08x2

Solving for variable 'x'.

Combine like terms: 0 + -2 = -2
-2 + -1.6x + 0.08x2 = 2 + 1.6x + -0.08x2 + -2 + -1.6x + 0.08x2

Reorder the terms:
-2 + -1.6x + 0.08x2 = 2 + -2 + 1.6x + -1.6x + -0.08x2 + 0.08x2

Combine like terms: 2 + -2 = 0
-2 + -1.6x + 0.08x2 = 0 + 1.6x + -1.6x + -0.08x2 + 0.08x2
-2 + -1.6x + 0.08x2 = 1.6x + -1.6x + -0.08x2 + 0.08x2

Combine like terms: 1.6x + -1.6x = 0.0
-2 + -1.6x + 0.08x2 = 0.0 + -0.08x2 + 0.08x2
-2 + -1.6x + 0.08x2 = -0.08x2 + 0.08x2

Combine like terms: -0.08x2 + 0.08x2 = 0.00
-2 + -1.6x + 0.08x2 = 0.00

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

Divide each side by '0.08'.
-25 + -20x + x2 = 0

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + -20x + 25 + x2 = 0 + 25

Reorder the terms:
-25 + 25 + -20x + x2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + -20x + x2 = 0 + 25
-20x + x2 = 0 + 25

Combine like terms: 0 + 25 = 25
-20x + x2 = 25

The x term is -20x.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20x + 100 + x2 = 25 + 100

Reorder the terms:
100 + -20x + x2 = 25 + 100

Combine like terms: 25 + 100 = 125
100 + -20x + x2 = 125

Factor a perfect square on the left side:
(x + -10)(x + -10) = 125

Calculate the square root of the right side: 11.180339887

Break this problem into two subproblems by setting 
(x + -10) equal to 11.180339887 and -11.180339887.

Subproblem 1

x + -10 = 11.180339887 Simplifying x + -10 = 11.180339887 Reorder the terms: -10 + x = 11.180339887 Solving -10 + x = 11.180339887 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = 11.180339887 + 10 Combine like terms: -10 + 10 = 0 0 + x = 11.180339887 + 10 x = 11.180339887 + 10 Combine like terms: 11.180339887 + 10 = 21.180339887 x = 21.180339887 Simplifying x = 21.180339887

Subproblem 2

x + -10 = -11.180339887 Simplifying x + -10 = -11.180339887 Reorder the terms: -10 + x = -11.180339887 Solving -10 + x = -11.180339887 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = -11.180339887 + 10 Combine like terms: -10 + 10 = 0 0 + x = -11.180339887 + 10 x = -11.180339887 + 10 Combine like terms: -11.180339887 + 10 = -1.180339887 x = -1.180339887 Simplifying x = -1.180339887

Solution

The solution to the problem is based on the solutions from the subproblems. x = {21.180339887, -1.180339887}

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