(x-0.2)(x+0.83)=0

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Solution for (x-0.2)(x+0.83)=0 equation:


Simplifying
(x + -0.2)(x + 0.83) = 0

Reorder the terms:
(-0.2 + x)(x + 0.83) = 0

Reorder the terms:
(-0.2 + x)(0.83 + x) = 0

Multiply (-0.2 + x) * (0.83 + x)
(-0.2(0.83 + x) + x(0.83 + x)) = 0
((0.83 * -0.2 + x * -0.2) + x(0.83 + x)) = 0
((-0.166 + -0.2x) + x(0.83 + x)) = 0
(-0.166 + -0.2x + (0.83 * x + x * x)) = 0
(-0.166 + -0.2x + (0.83x + x2)) = 0

Combine like terms: -0.2x + 0.83x = 0.63x
(-0.166 + 0.63x + x2) = 0

Solving
-0.166 + 0.63x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '0.166' to each side of the equation.
-0.166 + 0.63x + 0.166 + x2 = 0 + 0.166

Reorder the terms:
-0.166 + 0.166 + 0.63x + x2 = 0 + 0.166

Combine like terms: -0.166 + 0.166 = 0.000
0.000 + 0.63x + x2 = 0 + 0.166
0.63x + x2 = 0 + 0.166

Combine like terms: 0 + 0.166 = 0.166
0.63x + x2 = 0.166

The x term is 0.63x.  Take half its coefficient (0.315).
Square it (0.099225) and add it to both sides.

Add '0.099225' to each side of the equation.
0.63x + 0.099225 + x2 = 0.166 + 0.099225

Reorder the terms:
0.099225 + 0.63x + x2 = 0.166 + 0.099225

Combine like terms: 0.166 + 0.099225 = 0.265225
0.099225 + 0.63x + x2 = 0.265225

Factor a perfect square on the left side:
(x + 0.315)(x + 0.315) = 0.265225

Calculate the square root of the right side: 0.515

Break this problem into two subproblems by setting 
(x + 0.315) equal to 0.515 and -0.515.

Subproblem 1

x + 0.315 = 0.515 Simplifying x + 0.315 = 0.515 Reorder the terms: 0.315 + x = 0.515 Solving 0.315 + x = 0.515 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.315' to each side of the equation. 0.315 + -0.315 + x = 0.515 + -0.315 Combine like terms: 0.315 + -0.315 = 0.000 0.000 + x = 0.515 + -0.315 x = 0.515 + -0.315 Combine like terms: 0.515 + -0.315 = 0.2 x = 0.2 Simplifying x = 0.2

Subproblem 2

x + 0.315 = -0.515 Simplifying x + 0.315 = -0.515 Reorder the terms: 0.315 + x = -0.515 Solving 0.315 + x = -0.515 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.315' to each side of the equation. 0.315 + -0.315 + x = -0.515 + -0.315 Combine like terms: 0.315 + -0.315 = 0.000 0.000 + x = -0.515 + -0.315 x = -0.515 + -0.315 Combine like terms: -0.515 + -0.315 = -0.83 x = -0.83 Simplifying x = -0.83

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.2, -0.83}

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