(12-x)5x=42

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Solution for (12-x)5x=42 equation:


Simplifying
(12 + -1x) * 5x = 42

Reorder the terms for easier multiplication:
5x(12 + -1x) = 42
(12 * 5x + -1x * 5x) = 42
(60x + -5x2) = 42

Solving
60x + -5x2 = 42

Solving for variable 'x'.

Reorder the terms:
-42 + 60x + -5x2 = 42 + -42

Combine like terms: 42 + -42 = 0
-42 + 60x + -5x2 = 0

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

Divide each side by '-5'.
8.4 + -12x + x2 = 0

Move the constant term to the right:

Add '-8.4' to each side of the equation.
8.4 + -12x + -8.4 + x2 = 0 + -8.4

Reorder the terms:
8.4 + -8.4 + -12x + x2 = 0 + -8.4

Combine like terms: 8.4 + -8.4 = 0.0
0.0 + -12x + x2 = 0 + -8.4
-12x + x2 = 0 + -8.4

Combine like terms: 0 + -8.4 = -8.4
-12x + x2 = -8.4

The x term is -12x.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12x + 36 + x2 = -8.4 + 36

Reorder the terms:
36 + -12x + x2 = -8.4 + 36

Combine like terms: -8.4 + 36 = 27.6
36 + -12x + x2 = 27.6

Factor a perfect square on the left side:
(x + -6)(x + -6) = 27.6

Calculate the square root of the right side: 5.253570215

Break this problem into two subproblems by setting 
(x + -6) equal to 5.253570215 and -5.253570215.

Subproblem 1

x + -6 = 5.253570215 Simplifying x + -6 = 5.253570215 Reorder the terms: -6 + x = 5.253570215 Solving -6 + x = 5.253570215 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = 5.253570215 + 6 Combine like terms: -6 + 6 = 0 0 + x = 5.253570215 + 6 x = 5.253570215 + 6 Combine like terms: 5.253570215 + 6 = 11.253570215 x = 11.253570215 Simplifying x = 11.253570215

Subproblem 2

x + -6 = -5.253570215 Simplifying x + -6 = -5.253570215 Reorder the terms: -6 + x = -5.253570215 Solving -6 + x = -5.253570215 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = -5.253570215 + 6 Combine like terms: -6 + 6 = 0 0 + x = -5.253570215 + 6 x = -5.253570215 + 6 Combine like terms: -5.253570215 + 6 = 0.746429785 x = 0.746429785 Simplifying x = 0.746429785

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.253570215, 0.746429785}

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