.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 = -14
-14 + 10x + -1.2x + 0.2x2 = 8 + 1.2x + -8 + -1.2x

Combine like terms: 10x + -1.2x = 8.8x
-14 + 8.8x + 0.2x2 = 8 + 1.2x + -8 + -1.2x

Reorder the terms:
-14 + 8.8x + 0.2x2 = 8 + -8 + 1.2x + -1.2x

Combine like terms: 8 + -8 = 0
-14 + 8.8x + 0.2x2 = 0 + 1.2x + -1.2x
-14 + 8.8x + 0.2x2 = 1.2x + -1.2x

Combine like terms: 1.2x + -1.2x = 0.0
-14 + 8.8x + 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'.
-70 + 44x + x2 = 0

Move the constant term to the right:

Add '70' to each side of the equation.
-70 + 44x + 70 + x2 = 0 + 70

Reorder the terms:
-70 + 70 + 44x + x2 = 0 + 70

Combine like terms: -70 + 70 = 0
0 + 44x + x2 = 0 + 70
44x + x2 = 0 + 70

Combine like terms: 0 + 70 = 70
44x + x2 = 70

The x term is 44x.  Take half its coefficient (22).
Square it (484) and add it to both sides.

Add '484' to each side of the equation.
44x + 484 + x2 = 70 + 484

Reorder the terms:
484 + 44x + x2 = 70 + 484

Combine like terms: 70 + 484 = 554
484 + 44x + x2 = 554

Factor a perfect square on the left side:
(x + 22)(x + 22) = 554

Calculate the square root of the right side: 23.537204592

Break this problem into two subproblems by setting 
(x + 22) equal to 23.537204592 and -23.537204592.

Subproblem 1

x + 22 = 23.537204592 Simplifying x + 22 = 23.537204592 Reorder the terms: 22 + x = 23.537204592 Solving 22 + x = 23.537204592 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-22' to each side of the equation. 22 + -22 + x = 23.537204592 + -22 Combine like terms: 22 + -22 = 0 0 + x = 23.537204592 + -22 x = 23.537204592 + -22 Combine like terms: 23.537204592 + -22 = 1.537204592 x = 1.537204592 Simplifying x = 1.537204592

Subproblem 2

x + 22 = -23.537204592 Simplifying x + 22 = -23.537204592 Reorder the terms: 22 + x = -23.537204592 Solving 22 + x = -23.537204592 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-22' to each side of the equation. 22 + -22 + x = -23.537204592 + -22 Combine like terms: 22 + -22 = 0 0 + x = -23.537204592 + -22 x = -23.537204592 + -22 Combine like terms: -23.537204592 + -22 = -45.537204592 x = -45.537204592 Simplifying x = -45.537204592

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.537204592, -45.537204592}

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