(12-0.3x)(2-0.1x)=0

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Solution for (12-0.3x)(2-0.1x)=0 equation:


Simplifying
(12 + -0.3x)(2 + -0.1x) = 0

Multiply (12 + -0.3x) * (2 + -0.1x)
(12(2 + -0.1x) + -0.3x * (2 + -0.1x)) = 0
((2 * 12 + -0.1x * 12) + -0.3x * (2 + -0.1x)) = 0
((24 + -1.2x) + -0.3x * (2 + -0.1x)) = 0
(24 + -1.2x + (2 * -0.3x + -0.1x * -0.3x)) = 0
(24 + -1.2x + (-0.6x + 0.03x2)) = 0

Combine like terms: -1.2x + -0.6x = -1.8x
(24 + -1.8x + 0.03x2) = 0

Solving
24 + -1.8x + 0.03x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.03'.
800 + -60x + x2 = 0

Move the constant term to the right:

Add '-800' to each side of the equation.
800 + -60x + -800 + x2 = 0 + -800

Reorder the terms:
800 + -800 + -60x + x2 = 0 + -800

Combine like terms: 800 + -800 = 0
0 + -60x + x2 = 0 + -800
-60x + x2 = 0 + -800

Combine like terms: 0 + -800 = -800
-60x + x2 = -800

The x term is -60x.  Take half its coefficient (-30).
Square it (900) and add it to both sides.

Add '900' to each side of the equation.
-60x + 900 + x2 = -800 + 900

Reorder the terms:
900 + -60x + x2 = -800 + 900

Combine like terms: -800 + 900 = 100
900 + -60x + x2 = 100

Factor a perfect square on the left side:
(x + -30)(x + -30) = 100

Calculate the square root of the right side: 10

Break this problem into two subproblems by setting 
(x + -30) equal to 10 and -10.

Subproblem 1

x + -30 = 10 Simplifying x + -30 = 10 Reorder the terms: -30 + x = 10 Solving -30 + x = 10 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + x = 10 + 30 Combine like terms: -30 + 30 = 0 0 + x = 10 + 30 x = 10 + 30 Combine like terms: 10 + 30 = 40 x = 40 Simplifying x = 40

Subproblem 2

x + -30 = -10 Simplifying x + -30 = -10 Reorder the terms: -30 + x = -10 Solving -30 + x = -10 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + x = -10 + 30 Combine like terms: -30 + 30 = 0 0 + x = -10 + 30 x = -10 + 30 Combine like terms: -10 + 30 = 20 x = 20 Simplifying x = 20

Solution

The solution to the problem is based on the solutions from the subproblems. x = {40, 20}

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