267=0.125x^2-0.8x+99

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Solution for 267=0.125x^2-0.8x+99 equation:


Simplifying
267 = 0.125x2 + -0.8x + 99

Reorder the terms:
267 = 99 + -0.8x + 0.125x2

Solving
267 = 99 + -0.8x + 0.125x2

Solving for variable 'x'.

Combine like terms: 267 + -99 = 168
168 + 0.8x + -0.125x2 = 99 + -0.8x + 0.125x2 + -99 + 0.8x + -0.125x2

Reorder the terms:
168 + 0.8x + -0.125x2 = 99 + -99 + -0.8x + 0.8x + 0.125x2 + -0.125x2

Combine like terms: 99 + -99 = 0
168 + 0.8x + -0.125x2 = 0 + -0.8x + 0.8x + 0.125x2 + -0.125x2
168 + 0.8x + -0.125x2 = -0.8x + 0.8x + 0.125x2 + -0.125x2

Combine like terms: -0.8x + 0.8x = 0.0
168 + 0.8x + -0.125x2 = 0.0 + 0.125x2 + -0.125x2
168 + 0.8x + -0.125x2 = 0.125x2 + -0.125x2

Combine like terms: 0.125x2 + -0.125x2 = 0.000
168 + 0.8x + -0.125x2 = 0.000

Begin completing the square.  Divide all terms by
-0.125 the coefficient of the squared term: 

Divide each side by '-0.125'.
-1344 + -6.4x + x2 = 0

Move the constant term to the right:

Add '1344' to each side of the equation.
-1344 + -6.4x + 1344 + x2 = 0 + 1344

Reorder the terms:
-1344 + 1344 + -6.4x + x2 = 0 + 1344

Combine like terms: -1344 + 1344 = 0
0 + -6.4x + x2 = 0 + 1344
-6.4x + x2 = 0 + 1344

Combine like terms: 0 + 1344 = 1344
-6.4x + x2 = 1344

The x term is -6.4x.  Take half its coefficient (-3.2).
Square it (10.24) and add it to both sides.

Add '10.24' to each side of the equation.
-6.4x + 10.24 + x2 = 1344 + 10.24

Reorder the terms:
10.24 + -6.4x + x2 = 1344 + 10.24

Combine like terms: 1344 + 10.24 = 1354.24
10.24 + -6.4x + x2 = 1354.24

Factor a perfect square on the left side:
(x + -3.2)(x + -3.2) = 1354.24

Calculate the square root of the right side: 36.8

Break this problem into two subproblems by setting 
(x + -3.2) equal to 36.8 and -36.8.

Subproblem 1

x + -3.2 = 36.8 Simplifying x + -3.2 = 36.8 Reorder the terms: -3.2 + x = 36.8 Solving -3.2 + x = 36.8 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.2' to each side of the equation. -3.2 + 3.2 + x = 36.8 + 3.2 Combine like terms: -3.2 + 3.2 = 0.0 0.0 + x = 36.8 + 3.2 x = 36.8 + 3.2 Combine like terms: 36.8 + 3.2 = 40 x = 40 Simplifying x = 40

Subproblem 2

x + -3.2 = -36.8 Simplifying x + -3.2 = -36.8 Reorder the terms: -3.2 + x = -36.8 Solving -3.2 + x = -36.8 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.2' to each side of the equation. -3.2 + 3.2 + x = -36.8 + 3.2 Combine like terms: -3.2 + 3.2 = 0.0 0.0 + x = -36.8 + 3.2 x = -36.8 + 3.2 Combine like terms: -36.8 + 3.2 = -33.6 x = -33.6 Simplifying x = -33.6

Solution

The solution to the problem is based on the solutions from the subproblems. x = {40, -33.6}

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