0.9x-2.1+0.9=0.2x(5-x)

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Solution for 0.9x-2.1+0.9=0.2x(5-x) equation:


Simplifying
0.9x + -2.1 + 0.9 = 0.2x(5 + -1x)

Reorder the terms:
-2.1 + 0.9 + 0.9x = 0.2x(5 + -1x)

Combine like terms: -2.1 + 0.9 = -1.2
-1.2 + 0.9x = 0.2x(5 + -1x)
-1.2 + 0.9x = (5 * 0.2x + -1x * 0.2x)
-1.2 + 0.9x = (1x + -0.2x2)

Solving
-1.2 + 0.9x = 1x + -0.2x2

Solving for variable 'x'.

Combine like terms: 0.9x + -1x = -0.1x
-1.2 + -0.1x + 0.2x2 = 1x + -0.2x2 + -1x + 0.2x2

Reorder the terms:
-1.2 + -0.1x + 0.2x2 = 1x + -1x + -0.2x2 + 0.2x2

Combine like terms: 1x + -1x = 0
-1.2 + -0.1x + 0.2x2 = 0 + -0.2x2 + 0.2x2
-1.2 + -0.1x + 0.2x2 = -0.2x2 + 0.2x2

Combine like terms: -0.2x2 + 0.2x2 = 0.0
-1.2 + -0.1x + 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'.
-6 + -0.5x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -0.5x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + -0.5x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -0.5x + x2 = 0 + 6
-0.5x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
-0.5x + x2 = 6

The x term is -0.5x.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5x + 0.0625 + x2 = 6 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 6 + 0.0625

Combine like terms: 6 + 0.0625 = 6.0625
0.0625 + -0.5x + x2 = 6.0625

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 6.0625

Calculate the square root of the right side: 2.46221445

Break this problem into two subproblems by setting 
(x + -0.25) equal to 2.46221445 and -2.46221445.

Subproblem 1

x + -0.25 = 2.46221445 Simplifying x + -0.25 = 2.46221445 Reorder the terms: -0.25 + x = 2.46221445 Solving -0.25 + x = 2.46221445 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = 2.46221445 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 2.46221445 + 0.25 x = 2.46221445 + 0.25 Combine like terms: 2.46221445 + 0.25 = 2.71221445 x = 2.71221445 Simplifying x = 2.71221445

Subproblem 2

x + -0.25 = -2.46221445 Simplifying x + -0.25 = -2.46221445 Reorder the terms: -0.25 + x = -2.46221445 Solving -0.25 + x = -2.46221445 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = -2.46221445 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -2.46221445 + 0.25 x = -2.46221445 + 0.25 Combine like terms: -2.46221445 + 0.25 = -2.21221445 x = -2.21221445 Simplifying x = -2.21221445

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.71221445, -2.21221445}

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