((0.79-X)(0.21-X))=0.0011

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Solution for ((0.79-X)(0.21-X))=0.0011 equation:


Simplifying
((0.79 + -1X)(0.21 + -1X)) = 0.0011

Multiply (0.79 + -1X) * (0.21 + -1X)
((0.79(0.21 + -1X) + -1X * (0.21 + -1X))) = 0.0011
(((0.21 * 0.79 + -1X * 0.79) + -1X * (0.21 + -1X))) = 0.0011
(((0.1659 + -0.79X) + -1X * (0.21 + -1X))) = 0.0011
((0.1659 + -0.79X + (0.21 * -1X + -1X * -1X))) = 0.0011
((0.1659 + -0.79X + (-0.21X + 1X2))) = 0.0011

Combine like terms: -0.79X + -0.21X = -1X
((0.1659 + -1X + 1X2)) = 0.0011
(0.1659 + -1X + 1X2) = 0.0011

Remove parenthesis around (0.1659 + -1X + 1X2)
0.1659 + -1X + 1X2 = 0.0011

Solving
0.1659 + -1X + 1X2 = 0.0011

Solving for variable 'X'.

Reorder the terms:
0.1659 + -0.0011 + -1X + 1X2 = 0.0011 + -0.0011

Combine like terms: 0.1659 + -0.0011 = 0.1648
0.1648 + -1X + 1X2 = 0.0011 + -0.0011

Combine like terms: 0.0011 + -0.0011 = 0.0000
0.1648 + -1X + 1X2 = 0.0000

Begin completing the square.

Move the constant term to the right:

Add '-0.1648' to each side of the equation.
0.1648 + -1X + -0.1648 + X2 = 0.0000 + -0.1648

Reorder the terms:
0.1648 + -0.1648 + -1X + X2 = 0.0000 + -0.1648

Combine like terms: 0.1648 + -0.1648 = 0.0000
0.0000 + -1X + X2 = 0.0000 + -0.1648
-1X + X2 = 0.0000 + -0.1648

Combine like terms: 0.0000 + -0.1648 = -0.1648
-1X + X2 = -0.1648

The X term is -1X.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1X + 0.25 + X2 = -0.1648 + 0.25

Reorder the terms:
0.25 + -1X + X2 = -0.1648 + 0.25

Combine like terms: -0.1648 + 0.25 = 0.0852
0.25 + -1X + X2 = 0.0852

Factor a perfect square on the left side:
(X + -0.5)(X + -0.5) = 0.0852

Calculate the square root of the right side: 0.29189039

Break this problem into two subproblems by setting 
(X + -0.5) equal to 0.29189039 and -0.29189039.

Subproblem 1

X + -0.5 = 0.29189039 Simplifying X + -0.5 = 0.29189039 Reorder the terms: -0.5 + X = 0.29189039 Solving -0.5 + X = 0.29189039 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + X = 0.29189039 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + X = 0.29189039 + 0.5 X = 0.29189039 + 0.5 Combine like terms: 0.29189039 + 0.5 = 0.79189039 X = 0.79189039 Simplifying X = 0.79189039

Subproblem 2

X + -0.5 = -0.29189039 Simplifying X + -0.5 = -0.29189039 Reorder the terms: -0.5 + X = -0.29189039 Solving -0.5 + X = -0.29189039 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + X = -0.29189039 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + X = -0.29189039 + 0.5 X = -0.29189039 + 0.5 Combine like terms: -0.29189039 + 0.5 = 0.20810961 X = 0.20810961 Simplifying X = 0.20810961

Solution

The solution to the problem is based on the solutions from the subproblems. X = {0.79189039, 0.20810961}

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