0=-.1x^2+8x-50

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Solution for 0=-.1x^2+8x-50 equation:


Simplifying
0 = -0.1x2 + 8x + -50

Reorder the terms:
0 = -50 + 8x + -0.1x2

Solving
0 = -50 + 8x + -0.1x2

Solving for variable 'x'.

Combine like terms: 0 + 50 = 50
50 + -8x + 0.1x2 = -50 + 8x + -0.1x2 + 50 + -8x + 0.1x2

Reorder the terms:
50 + -8x + 0.1x2 = -50 + 50 + 8x + -8x + -0.1x2 + 0.1x2

Combine like terms: -50 + 50 = 0
50 + -8x + 0.1x2 = 0 + 8x + -8x + -0.1x2 + 0.1x2
50 + -8x + 0.1x2 = 8x + -8x + -0.1x2 + 0.1x2

Combine like terms: 8x + -8x = 0
50 + -8x + 0.1x2 = 0 + -0.1x2 + 0.1x2
50 + -8x + 0.1x2 = -0.1x2 + 0.1x2

Combine like terms: -0.1x2 + 0.1x2 = 0.0
50 + -8x + 0.1x2 = 0.0

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

Divide each side by '0.1'.
500 + -80x + x2 = 0

Move the constant term to the right:

Add '-500' to each side of the equation.
500 + -80x + -500 + x2 = 0 + -500

Reorder the terms:
500 + -500 + -80x + x2 = 0 + -500

Combine like terms: 500 + -500 = 0
0 + -80x + x2 = 0 + -500
-80x + x2 = 0 + -500

Combine like terms: 0 + -500 = -500
-80x + x2 = -500

The x term is -80x.  Take half its coefficient (-40).
Square it (1600) and add it to both sides.

Add '1600' to each side of the equation.
-80x + 1600 + x2 = -500 + 1600

Reorder the terms:
1600 + -80x + x2 = -500 + 1600

Combine like terms: -500 + 1600 = 1100
1600 + -80x + x2 = 1100

Factor a perfect square on the left side:
(x + -40)(x + -40) = 1100

Calculate the square root of the right side: 33.166247904

Break this problem into two subproblems by setting 
(x + -40) equal to 33.166247904 and -33.166247904.

Subproblem 1

x + -40 = 33.166247904 Simplifying x + -40 = 33.166247904 Reorder the terms: -40 + x = 33.166247904 Solving -40 + x = 33.166247904 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + x = 33.166247904 + 40 Combine like terms: -40 + 40 = 0 0 + x = 33.166247904 + 40 x = 33.166247904 + 40 Combine like terms: 33.166247904 + 40 = 73.166247904 x = 73.166247904 Simplifying x = 73.166247904

Subproblem 2

x + -40 = -33.166247904 Simplifying x + -40 = -33.166247904 Reorder the terms: -40 + x = -33.166247904 Solving -40 + x = -33.166247904 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + x = -33.166247904 + 40 Combine like terms: -40 + 40 = 0 0 + x = -33.166247904 + 40 x = -33.166247904 + 40 Combine like terms: -33.166247904 + 40 = 6.833752096 x = 6.833752096 Simplifying x = 6.833752096

Solution

The solution to the problem is based on the solutions from the subproblems. x = {73.166247904, 6.833752096}

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