0.5x^2-8x+30.5=0

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Solution for 0.5x^2-8x+30.5=0 equation:


Simplifying
0.5x2 + -8x + 30.5 = 0

Reorder the terms:
30.5 + -8x + 0.5x2 = 0

Solving
30.5 + -8x + 0.5x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.5'.
61 + -16x + x2 = 0

Move the constant term to the right:

Add '-61' to each side of the equation.
61 + -16x + -61 + x2 = 0 + -61

Reorder the terms:
61 + -61 + -16x + x2 = 0 + -61

Combine like terms: 61 + -61 = 0
0 + -16x + x2 = 0 + -61
-16x + x2 = 0 + -61

Combine like terms: 0 + -61 = -61
-16x + x2 = -61

The x term is -16x.  Take half its coefficient (-8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
-16x + 64 + x2 = -61 + 64

Reorder the terms:
64 + -16x + x2 = -61 + 64

Combine like terms: -61 + 64 = 3
64 + -16x + x2 = 3

Factor a perfect square on the left side:
(x + -8)(x + -8) = 3

Calculate the square root of the right side: 1.732050808

Break this problem into two subproblems by setting 
(x + -8) equal to 1.732050808 and -1.732050808.

Subproblem 1

x + -8 = 1.732050808 Simplifying x + -8 = 1.732050808 Reorder the terms: -8 + x = 1.732050808 Solving -8 + x = 1.732050808 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x = 1.732050808 + 8 Combine like terms: -8 + 8 = 0 0 + x = 1.732050808 + 8 x = 1.732050808 + 8 Combine like terms: 1.732050808 + 8 = 9.732050808 x = 9.732050808 Simplifying x = 9.732050808

Subproblem 2

x + -8 = -1.732050808 Simplifying x + -8 = -1.732050808 Reorder the terms: -8 + x = -1.732050808 Solving -8 + x = -1.732050808 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x = -1.732050808 + 8 Combine like terms: -8 + 8 = 0 0 + x = -1.732050808 + 8 x = -1.732050808 + 8 Combine like terms: -1.732050808 + 8 = 6.267949192 x = 6.267949192 Simplifying x = 6.267949192

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.732050808, 6.267949192}

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