x(8-x)+9x=-6

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Solution for x(8-x)+9x=-6 equation:


Simplifying
x(8 + -1x) + 9x = -6
(8 * x + -1x * x) + 9x = -6
(8x + -1x2) + 9x = -6

Reorder the terms:
8x + 9x + -1x2 = -6

Combine like terms: 8x + 9x = 17x
17x + -1x2 = -6

Solving
17x + -1x2 = -6

Solving for variable 'x'.

Reorder the terms:
6 + 17x + -1x2 = -6 + 6

Combine like terms: -6 + 6 = 0
6 + 17x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-6 + -17x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -17x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + -17x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -17x + x2 = 0 + 6
-17x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
-17x + x2 = 6

The x term is -17x.  Take half its coefficient (-8.5).
Square it (72.25) and add it to both sides.

Add '72.25' to each side of the equation.
-17x + 72.25 + x2 = 6 + 72.25

Reorder the terms:
72.25 + -17x + x2 = 6 + 72.25

Combine like terms: 6 + 72.25 = 78.25
72.25 + -17x + x2 = 78.25

Factor a perfect square on the left side:
(x + -8.5)(x + -8.5) = 78.25

Calculate the square root of the right side: 8.845903006

Break this problem into two subproblems by setting 
(x + -8.5) equal to 8.845903006 and -8.845903006.

Subproblem 1

x + -8.5 = 8.845903006 Simplifying x + -8.5 = 8.845903006 Reorder the terms: -8.5 + x = 8.845903006 Solving -8.5 + x = 8.845903006 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8.5' to each side of the equation. -8.5 + 8.5 + x = 8.845903006 + 8.5 Combine like terms: -8.5 + 8.5 = 0.0 0.0 + x = 8.845903006 + 8.5 x = 8.845903006 + 8.5 Combine like terms: 8.845903006 + 8.5 = 17.345903006 x = 17.345903006 Simplifying x = 17.345903006

Subproblem 2

x + -8.5 = -8.845903006 Simplifying x + -8.5 = -8.845903006 Reorder the terms: -8.5 + x = -8.845903006 Solving -8.5 + x = -8.845903006 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8.5' to each side of the equation. -8.5 + 8.5 + x = -8.845903006 + 8.5 Combine like terms: -8.5 + 8.5 = 0.0 0.0 + x = -8.845903006 + 8.5 x = -8.845903006 + 8.5 Combine like terms: -8.845903006 + 8.5 = -0.345903006 x = -0.345903006 Simplifying x = -0.345903006

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.345903006, -0.345903006}

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