5x-x^2=-168

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Solution for 5x-x^2=-168 equation:


Simplifying
5x + -1x2 = -168

Solving
5x + -1x2 = -168

Solving for variable 'x'.

Reorder the terms:
168 + 5x + -1x2 = -168 + 168

Combine like terms: -168 + 168 = 0
168 + 5x + -1x2 = 0

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

Divide each side by '-1'.
-168 + -5x + x2 = 0

Move the constant term to the right:

Add '168' to each side of the equation.
-168 + -5x + 168 + x2 = 0 + 168

Reorder the terms:
-168 + 168 + -5x + x2 = 0 + 168

Combine like terms: -168 + 168 = 0
0 + -5x + x2 = 0 + 168
-5x + x2 = 0 + 168

Combine like terms: 0 + 168 = 168
-5x + x2 = 168

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 168 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 168 + 6.25

Combine like terms: 168 + 6.25 = 174.25
6.25 + -5x + x2 = 174.25

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 174.25

Calculate the square root of the right side: 13.200378782

Break this problem into two subproblems by setting 
(x + -2.5) equal to 13.200378782 and -13.200378782.

Subproblem 1

x + -2.5 = 13.200378782 Simplifying x + -2.5 = 13.200378782 Reorder the terms: -2.5 + x = 13.200378782 Solving -2.5 + x = 13.200378782 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 13.200378782 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 13.200378782 + 2.5 x = 13.200378782 + 2.5 Combine like terms: 13.200378782 + 2.5 = 15.700378782 x = 15.700378782 Simplifying x = 15.700378782

Subproblem 2

x + -2.5 = -13.200378782 Simplifying x + -2.5 = -13.200378782 Reorder the terms: -2.5 + x = -13.200378782 Solving -2.5 + x = -13.200378782 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -13.200378782 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -13.200378782 + 2.5 x = -13.200378782 + 2.5 Combine like terms: -13.200378782 + 2.5 = -10.700378782 x = -10.700378782 Simplifying x = -10.700378782

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.700378782, -10.700378782}

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