(0.1x+0.3)(0.4x-20)=0

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Solution for (0.1x+0.3)(0.4x-20)=0 equation:


Simplifying
(0.1x + 0.3)(0.4x + -20) = 0

Reorder the terms:
(0.3 + 0.1x)(0.4x + -20) = 0

Reorder the terms:
(0.3 + 0.1x)(-20 + 0.4x) = 0

Multiply (0.3 + 0.1x) * (-20 + 0.4x)
(0.3(-20 + 0.4x) + 0.1x * (-20 + 0.4x)) = 0
((-20 * 0.3 + 0.4x * 0.3) + 0.1x * (-20 + 0.4x)) = 0
((-6 + 0.12x) + 0.1x * (-20 + 0.4x)) = 0
(-6 + 0.12x + (-20 * 0.1x + 0.4x * 0.1x)) = 0
(-6 + 0.12x + (-2x + 0.04x2)) = 0

Combine like terms: 0.12x + -2x = -1.88x
(-6 + -1.88x + 0.04x2) = 0

Solving
-6 + -1.88x + 0.04x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.04'.
-150 + -47x + x2 = 0

Move the constant term to the right:

Add '150' to each side of the equation.
-150 + -47x + 150 + x2 = 0 + 150

Reorder the terms:
-150 + 150 + -47x + x2 = 0 + 150

Combine like terms: -150 + 150 = 0
0 + -47x + x2 = 0 + 150
-47x + x2 = 0 + 150

Combine like terms: 0 + 150 = 150
-47x + x2 = 150

The x term is -47x.  Take half its coefficient (-23.5).
Square it (552.25) and add it to both sides.

Add '552.25' to each side of the equation.
-47x + 552.25 + x2 = 150 + 552.25

Reorder the terms:
552.25 + -47x + x2 = 150 + 552.25

Combine like terms: 150 + 552.25 = 702.25
552.25 + -47x + x2 = 702.25

Factor a perfect square on the left side:
(x + -23.5)(x + -23.5) = 702.25

Calculate the square root of the right side: 26.5

Break this problem into two subproblems by setting 
(x + -23.5) equal to 26.5 and -26.5.

Subproblem 1

x + -23.5 = 26.5 Simplifying x + -23.5 = 26.5 Reorder the terms: -23.5 + x = 26.5 Solving -23.5 + x = 26.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '23.5' to each side of the equation. -23.5 + 23.5 + x = 26.5 + 23.5 Combine like terms: -23.5 + 23.5 = 0.0 0.0 + x = 26.5 + 23.5 x = 26.5 + 23.5 Combine like terms: 26.5 + 23.5 = 50 x = 50 Simplifying x = 50

Subproblem 2

x + -23.5 = -26.5 Simplifying x + -23.5 = -26.5 Reorder the terms: -23.5 + x = -26.5 Solving -23.5 + x = -26.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '23.5' to each side of the equation. -23.5 + 23.5 + x = -26.5 + 23.5 Combine like terms: -23.5 + 23.5 = 0.0 0.0 + x = -26.5 + 23.5 x = -26.5 + 23.5 Combine like terms: -26.5 + 23.5 = -3 x = -3 Simplifying x = -3

Solution

The solution to the problem is based on the solutions from the subproblems. x = {50, -3}

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