0=x(5x+.5)-168

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Solution for 0=x(5x+.5)-168 equation:


Simplifying
0 = x(5x + 0.5) + -168

Reorder the terms:
0 = x(0.5 + 5x) + -168
0 = (0.5 * x + 5x * x) + -168
0 = (0.5x + 5x2) + -168

Reorder the terms:
0 = -168 + 0.5x + 5x2

Solving
0 = -168 + 0.5x + 5x2

Solving for variable 'x'.

Combine like terms: 0 + 168 = 168
168 + -0.5x + -5x2 = -168 + 0.5x + 5x2 + 168 + -0.5x + -5x2

Reorder the terms:
168 + -0.5x + -5x2 = -168 + 168 + 0.5x + -0.5x + 5x2 + -5x2

Combine like terms: -168 + 168 = 0
168 + -0.5x + -5x2 = 0 + 0.5x + -0.5x + 5x2 + -5x2
168 + -0.5x + -5x2 = 0.5x + -0.5x + 5x2 + -5x2

Combine like terms: 0.5x + -0.5x = 0.0
168 + -0.5x + -5x2 = 0.0 + 5x2 + -5x2
168 + -0.5x + -5x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0
168 + -0.5x + -5x2 = 0

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-33.6 + 0.1x + x2 = 0

Move the constant term to the right:

Add '33.6' to each side of the equation.
-33.6 + 0.1x + 33.6 + x2 = 0 + 33.6

Reorder the terms:
-33.6 + 33.6 + 0.1x + x2 = 0 + 33.6

Combine like terms: -33.6 + 33.6 = 0.0
0.0 + 0.1x + x2 = 0 + 33.6
0.1x + x2 = 0 + 33.6

Combine like terms: 0 + 33.6 = 33.6
0.1x + x2 = 33.6

The x term is 0.1x.  Take half its coefficient (0.05).
Square it (0.0025) and add it to both sides.

Add '0.0025' to each side of the equation.
0.1x + 0.0025 + x2 = 33.6 + 0.0025

Reorder the terms:
0.0025 + 0.1x + x2 = 33.6 + 0.0025

Combine like terms: 33.6 + 0.0025 = 33.6025
0.0025 + 0.1x + x2 = 33.6025

Factor a perfect square on the left side:
(x + 0.05)(x + 0.05) = 33.6025

Calculate the square root of the right side: 5.79676634

Break this problem into two subproblems by setting 
(x + 0.05) equal to 5.79676634 and -5.79676634.

Subproblem 1

x + 0.05 = 5.79676634 Simplifying x + 0.05 = 5.79676634 Reorder the terms: 0.05 + x = 5.79676634 Solving 0.05 + x = 5.79676634 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.05' to each side of the equation. 0.05 + -0.05 + x = 5.79676634 + -0.05 Combine like terms: 0.05 + -0.05 = 0.00 0.00 + x = 5.79676634 + -0.05 x = 5.79676634 + -0.05 Combine like terms: 5.79676634 + -0.05 = 5.74676634 x = 5.74676634 Simplifying x = 5.74676634

Subproblem 2

x + 0.05 = -5.79676634 Simplifying x + 0.05 = -5.79676634 Reorder the terms: 0.05 + x = -5.79676634 Solving 0.05 + x = -5.79676634 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.05' to each side of the equation. 0.05 + -0.05 + x = -5.79676634 + -0.05 Combine like terms: 0.05 + -0.05 = 0.00 0.00 + x = -5.79676634 + -0.05 x = -5.79676634 + -0.05 Combine like terms: -5.79676634 + -0.05 = -5.84676634 x = -5.84676634 Simplifying x = -5.84676634

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.74676634, -5.84676634}

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