.6x(x+20)+.2x=28

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Solution for .6x(x+20)+.2x=28 equation:


Simplifying
0.6x(x + 20) + 0.2x = 28

Reorder the terms:
0.6x(20 + x) + 0.2x = 28
(20 * 0.6x + x * 0.6x) + 0.2x = 28
(12x + 0.6x2) + 0.2x = 28

Reorder the terms:
12x + 0.2x + 0.6x2 = 28

Combine like terms: 12x + 0.2x = 12.2x
12.2x + 0.6x2 = 28

Solving
12.2x + 0.6x2 = 28

Solving for variable 'x'.

Reorder the terms:
-28 + 12.2x + 0.6x2 = 28 + -28

Combine like terms: 28 + -28 = 0
-28 + 12.2x + 0.6x2 = 0

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

Divide each side by '0.6'.
-46.66666667 + 20.33333333x + x2 = 0

Move the constant term to the right:

Add '46.66666667' to each side of the equation.
-46.66666667 + 20.33333333x + 46.66666667 + x2 = 0 + 46.66666667

Reorder the terms:
-46.66666667 + 46.66666667 + 20.33333333x + x2 = 0 + 46.66666667

Combine like terms: -46.66666667 + 46.66666667 = 0.00000000
0.00000000 + 20.33333333x + x2 = 0 + 46.66666667
20.33333333x + x2 = 0 + 46.66666667

Combine like terms: 0 + 46.66666667 = 46.66666667
20.33333333x + x2 = 46.66666667

The x term is 20.33333333x.  Take half its coefficient (10.16666667).
Square it (103.3611112) and add it to both sides.

Add '103.3611112' to each side of the equation.
20.33333333x + 103.3611112 + x2 = 46.66666667 + 103.3611112

Reorder the terms:
103.3611112 + 20.33333333x + x2 = 46.66666667 + 103.3611112

Combine like terms: 46.66666667 + 103.3611112 = 150.02777787
103.3611112 + 20.33333333x + x2 = 150.02777787

Factor a perfect square on the left side:
(x + 10.16666667)(x + 10.16666667) = 150.02777787

Calculate the square root of the right side: 12.248582688

Break this problem into two subproblems by setting 
(x + 10.16666667) equal to 12.248582688 and -12.248582688.

Subproblem 1

x + 10.16666667 = 12.248582688 Simplifying x + 10.16666667 = 12.248582688 Reorder the terms: 10.16666667 + x = 12.248582688 Solving 10.16666667 + x = 12.248582688 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10.16666667' to each side of the equation. 10.16666667 + -10.16666667 + x = 12.248582688 + -10.16666667 Combine like terms: 10.16666667 + -10.16666667 = 0.00000000 0.00000000 + x = 12.248582688 + -10.16666667 x = 12.248582688 + -10.16666667 Combine like terms: 12.248582688 + -10.16666667 = 2.081916018 x = 2.081916018 Simplifying x = 2.081916018

Subproblem 2

x + 10.16666667 = -12.248582688 Simplifying x + 10.16666667 = -12.248582688 Reorder the terms: 10.16666667 + x = -12.248582688 Solving 10.16666667 + x = -12.248582688 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10.16666667' to each side of the equation. 10.16666667 + -10.16666667 + x = -12.248582688 + -10.16666667 Combine like terms: 10.16666667 + -10.16666667 = 0.00000000 0.00000000 + x = -12.248582688 + -10.16666667 x = -12.248582688 + -10.16666667 Combine like terms: -12.248582688 + -10.16666667 = -22.415249358 x = -22.415249358 Simplifying x = -22.415249358

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.081916018, -22.415249358}

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