3X(6-X)+2X=24

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Solution for 3X(6-X)+2X=24 equation:


Simplifying
3X(6 + -1X) + 2X = 24
(6 * 3X + -1X * 3X) + 2X = 24
(18X + -3X2) + 2X = 24

Reorder the terms:
18X + 2X + -3X2 = 24

Combine like terms: 18X + 2X = 20X
20X + -3X2 = 24

Solving
20X + -3X2 = 24

Solving for variable 'X'.

Reorder the terms:
-24 + 20X + -3X2 = 24 + -24

Combine like terms: 24 + -24 = 0
-24 + 20X + -3X2 = 0

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

Divide each side by '-3'.
8 + -6.666666667X + X2 = 0

Move the constant term to the right:

Add '-8' to each side of the equation.
8 + -6.666666667X + -8 + X2 = 0 + -8

Reorder the terms:
8 + -8 + -6.666666667X + X2 = 0 + -8

Combine like terms: 8 + -8 = 0
0 + -6.666666667X + X2 = 0 + -8
-6.666666667X + X2 = 0 + -8

Combine like terms: 0 + -8 = -8
-6.666666667X + X2 = -8

The X term is -6.666666667X.  Take half its coefficient (-3.333333334).
Square it (11.11111112) and add it to both sides.

Add '11.11111112' to each side of the equation.
-6.666666667X + 11.11111112 + X2 = -8 + 11.11111112

Reorder the terms:
11.11111112 + -6.666666667X + X2 = -8 + 11.11111112

Combine like terms: -8 + 11.11111112 = 3.11111112
11.11111112 + -6.666666667X + X2 = 3.11111112

Factor a perfect square on the left side:
(X + -3.333333334)(X + -3.333333334) = 3.11111112

Calculate the square root of the right side: 1.76383421

Break this problem into two subproblems by setting 
(X + -3.333333334) equal to 1.76383421 and -1.76383421.

Subproblem 1

X + -3.333333334 = 1.76383421 Simplifying X + -3.333333334 = 1.76383421 Reorder the terms: -3.333333334 + X = 1.76383421 Solving -3.333333334 + X = 1.76383421 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '3.333333334' to each side of the equation. -3.333333334 + 3.333333334 + X = 1.76383421 + 3.333333334 Combine like terms: -3.333333334 + 3.333333334 = 0.000000000 0.000000000 + X = 1.76383421 + 3.333333334 X = 1.76383421 + 3.333333334 Combine like terms: 1.76383421 + 3.333333334 = 5.097167544 X = 5.097167544 Simplifying X = 5.097167544

Subproblem 2

X + -3.333333334 = -1.76383421 Simplifying X + -3.333333334 = -1.76383421 Reorder the terms: -3.333333334 + X = -1.76383421 Solving -3.333333334 + X = -1.76383421 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '3.333333334' to each side of the equation. -3.333333334 + 3.333333334 + X = -1.76383421 + 3.333333334 Combine like terms: -3.333333334 + 3.333333334 = 0.000000000 0.000000000 + X = -1.76383421 + 3.333333334 X = -1.76383421 + 3.333333334 Combine like terms: -1.76383421 + 3.333333334 = 1.569499124 X = 1.569499124 Simplifying X = 1.569499124

Solution

The solution to the problem is based on the solutions from the subproblems. X = {5.097167544, 1.569499124}

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