.1x-(.05x)(x-20)=1.2

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Solution for .1x-(.05x)(x-20)=1.2 equation:


Simplifying
0.1x + -1(0.05x)(x + -20) = 1.2

Remove parenthesis around (0.05x)
0.1x + -1 * 0.05x(x + -20) = 1.2

Reorder the terms:
0.1x + -1 * 0.05x(-20 + x) = 1.2

Multiply -1 * 0.05
0.1x + -0.05x(-20 + x) = 1.2
0.1x + (-20 * -0.05x + x * -0.05x) = 1.2
0.1x + (1x + -0.05x2) = 1.2

Combine like terms: 0.1x + 1x = 1.1x
1.1x + -0.05x2 = 1.2

Solving
1.1x + -0.05x2 = 1.2

Solving for variable 'x'.

Reorder the terms:
-1.2 + 1.1x + -0.05x2 = 1.2 + -1.2

Combine like terms: 1.2 + -1.2 = 0.0
-1.2 + 1.1x + -0.05x2 = 0.0

Begin completing the square.  Divide all terms by
-0.05 the coefficient of the squared term: 

Divide each side by '-0.05'.
24 + -22x + x2 = 0

Move the constant term to the right:

Add '-24' to each side of the equation.
24 + -22x + -24 + x2 = 0 + -24

Reorder the terms:
24 + -24 + -22x + x2 = 0 + -24

Combine like terms: 24 + -24 = 0
0 + -22x + x2 = 0 + -24
-22x + x2 = 0 + -24

Combine like terms: 0 + -24 = -24
-22x + x2 = -24

The x term is -22x.  Take half its coefficient (-11).
Square it (121) and add it to both sides.

Add '121' to each side of the equation.
-22x + 121 + x2 = -24 + 121

Reorder the terms:
121 + -22x + x2 = -24 + 121

Combine like terms: -24 + 121 = 97
121 + -22x + x2 = 97

Factor a perfect square on the left side:
(x + -11)(x + -11) = 97

Calculate the square root of the right side: 9.848857802

Break this problem into two subproblems by setting 
(x + -11) equal to 9.848857802 and -9.848857802.

Subproblem 1

x + -11 = 9.848857802 Simplifying x + -11 = 9.848857802 Reorder the terms: -11 + x = 9.848857802 Solving -11 + x = 9.848857802 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + x = 9.848857802 + 11 Combine like terms: -11 + 11 = 0 0 + x = 9.848857802 + 11 x = 9.848857802 + 11 Combine like terms: 9.848857802 + 11 = 20.848857802 x = 20.848857802 Simplifying x = 20.848857802

Subproblem 2

x + -11 = -9.848857802 Simplifying x + -11 = -9.848857802 Reorder the terms: -11 + x = -9.848857802 Solving -11 + x = -9.848857802 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + x = -9.848857802 + 11 Combine like terms: -11 + 11 = 0 0 + x = -9.848857802 + 11 x = -9.848857802 + 11 Combine like terms: -9.848857802 + 11 = 1.151142198 x = 1.151142198 Simplifying x = 1.151142198

Solution

The solution to the problem is based on the solutions from the subproblems. x = {20.848857802, 1.151142198}

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