3x(x-8)+x=16

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Solution for 3x(x-8)+x=16 equation:


Simplifying
3x(x + -8) + x = 16

Reorder the terms:
3x(-8 + x) + x = 16
(-8 * 3x + x * 3x) + x = 16
(-24x + 3x2) + x = 16

Reorder the terms:
-24x + x + 3x2 = 16

Combine like terms: -24x + x = -23x
-23x + 3x2 = 16

Solving
-23x + 3x2 = 16

Solving for variable 'x'.

Reorder the terms:
-16 + -23x + 3x2 = 16 + -16

Combine like terms: 16 + -16 = 0
-16 + -23x + 3x2 = 0

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

Divide each side by '3'.
-5.333333333 + -7.666666667x + x2 = 0

Move the constant term to the right:

Add '5.333333333' to each side of the equation.
-5.333333333 + -7.666666667x + 5.333333333 + x2 = 0 + 5.333333333

Reorder the terms:
-5.333333333 + 5.333333333 + -7.666666667x + x2 = 0 + 5.333333333

Combine like terms: -5.333333333 + 5.333333333 = 0.000000000
0.000000000 + -7.666666667x + x2 = 0 + 5.333333333
-7.666666667x + x2 = 0 + 5.333333333

Combine like terms: 0 + 5.333333333 = 5.333333333
-7.666666667x + x2 = 5.333333333

The x term is -7.666666667x.  Take half its coefficient (-3.833333334).
Square it (14.69444445) and add it to both sides.

Add '14.69444445' to each side of the equation.
-7.666666667x + 14.69444445 + x2 = 5.333333333 + 14.69444445

Reorder the terms:
14.69444445 + -7.666666667x + x2 = 5.333333333 + 14.69444445

Combine like terms: 5.333333333 + 14.69444445 = 20.027777783
14.69444445 + -7.666666667x + x2 = 20.027777783

Factor a perfect square on the left side:
(x + -3.833333334)(x + -3.833333334) = 20.027777783

Calculate the square root of the right side: 4.475240528

Break this problem into two subproblems by setting 
(x + -3.833333334) equal to 4.475240528 and -4.475240528.

Subproblem 1

x + -3.833333334 = 4.475240528 Simplifying x + -3.833333334 = 4.475240528 Reorder the terms: -3.833333334 + x = 4.475240528 Solving -3.833333334 + x = 4.475240528 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.833333334' to each side of the equation. -3.833333334 + 3.833333334 + x = 4.475240528 + 3.833333334 Combine like terms: -3.833333334 + 3.833333334 = 0.000000000 0.000000000 + x = 4.475240528 + 3.833333334 x = 4.475240528 + 3.833333334 Combine like terms: 4.475240528 + 3.833333334 = 8.308573862 x = 8.308573862 Simplifying x = 8.308573862

Subproblem 2

x + -3.833333334 = -4.475240528 Simplifying x + -3.833333334 = -4.475240528 Reorder the terms: -3.833333334 + x = -4.475240528 Solving -3.833333334 + x = -4.475240528 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.833333334' to each side of the equation. -3.833333334 + 3.833333334 + x = -4.475240528 + 3.833333334 Combine like terms: -3.833333334 + 3.833333334 = 0.000000000 0.000000000 + x = -4.475240528 + 3.833333334 x = -4.475240528 + 3.833333334 Combine like terms: -4.475240528 + 3.833333334 = -0.641907194 x = -0.641907194 Simplifying x = -0.641907194

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.308573862, -0.641907194}

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