.2x(x-50)+6=.4(3x+20)

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Solution for .2x(x-50)+6=.4(3x+20) equation:


Simplifying
0.2x(x + -50) + 6 = 0.4(3x + 20)

Reorder the terms:
0.2x(-50 + x) + 6 = 0.4(3x + 20)
(-50 * 0.2x + x * 0.2x) + 6 = 0.4(3x + 20)
(-10x + 0.2x2) + 6 = 0.4(3x + 20)

Reorder the terms:
6 + -10x + 0.2x2 = 0.4(3x + 20)

Reorder the terms:
6 + -10x + 0.2x2 = 0.4(20 + 3x)
6 + -10x + 0.2x2 = (20 * 0.4 + 3x * 0.4)
6 + -10x + 0.2x2 = (8 + 1.2x)

Solving
6 + -10x + 0.2x2 = 8 + 1.2x

Solving for variable 'x'.

Reorder the terms:
6 + -8 + -10x + -1.2x + 0.2x2 = 8 + 1.2x + -8 + -1.2x

Combine like terms: 6 + -8 = -2
-2 + -10x + -1.2x + 0.2x2 = 8 + 1.2x + -8 + -1.2x

Combine like terms: -10x + -1.2x = -11.2x
-2 + -11.2x + 0.2x2 = 8 + 1.2x + -8 + -1.2x

Reorder the terms:
-2 + -11.2x + 0.2x2 = 8 + -8 + 1.2x + -1.2x

Combine like terms: 8 + -8 = 0
-2 + -11.2x + 0.2x2 = 0 + 1.2x + -1.2x
-2 + -11.2x + 0.2x2 = 1.2x + -1.2x

Combine like terms: 1.2x + -1.2x = 0.0
-2 + -11.2x + 0.2x2 = 0.0

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

Divide each side by '0.2'.
-10 + -56x + x2 = 0

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + -56x + 10 + x2 = 0 + 10

Reorder the terms:
-10 + 10 + -56x + x2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + -56x + x2 = 0 + 10
-56x + x2 = 0 + 10

Combine like terms: 0 + 10 = 10
-56x + x2 = 10

The x term is -56x.  Take half its coefficient (-28).
Square it (784) and add it to both sides.

Add '784' to each side of the equation.
-56x + 784 + x2 = 10 + 784

Reorder the terms:
784 + -56x + x2 = 10 + 784

Combine like terms: 10 + 784 = 794
784 + -56x + x2 = 794

Factor a perfect square on the left side:
(x + -28)(x + -28) = 794

Calculate the square root of the right side: 28.178005607

Break this problem into two subproblems by setting 
(x + -28) equal to 28.178005607 and -28.178005607.

Subproblem 1

x + -28 = 28.178005607 Simplifying x + -28 = 28.178005607 Reorder the terms: -28 + x = 28.178005607 Solving -28 + x = 28.178005607 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + x = 28.178005607 + 28 Combine like terms: -28 + 28 = 0 0 + x = 28.178005607 + 28 x = 28.178005607 + 28 Combine like terms: 28.178005607 + 28 = 56.178005607 x = 56.178005607 Simplifying x = 56.178005607

Subproblem 2

x + -28 = -28.178005607 Simplifying x + -28 = -28.178005607 Reorder the terms: -28 + x = -28.178005607 Solving -28 + x = -28.178005607 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + x = -28.178005607 + 28 Combine like terms: -28 + 28 = 0 0 + x = -28.178005607 + 28 x = -28.178005607 + 28 Combine like terms: -28.178005607 + 28 = -0.178005607 x = -0.178005607 Simplifying x = -0.178005607

Solution

The solution to the problem is based on the solutions from the subproblems. x = {56.178005607, -0.178005607}

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