(x+0.2)(x+4.3)=0

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Solution for (x+0.2)(x+4.3)=0 equation:


Simplifying
(x + 0.2)(x + 4.3) = 0

Reorder the terms:
(0.2 + x)(x + 4.3) = 0

Reorder the terms:
(0.2 + x)(4.3 + x) = 0

Multiply (0.2 + x) * (4.3 + x)
(0.2(4.3 + x) + x(4.3 + x)) = 0
((4.3 * 0.2 + x * 0.2) + x(4.3 + x)) = 0
((0.86 + 0.2x) + x(4.3 + x)) = 0
(0.86 + 0.2x + (4.3 * x + x * x)) = 0
(0.86 + 0.2x + (4.3x + x2)) = 0

Combine like terms: 0.2x + 4.3x = 4.5x
(0.86 + 4.5x + x2) = 0

Solving
0.86 + 4.5x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-0.86' to each side of the equation.
0.86 + 4.5x + -0.86 + x2 = 0 + -0.86

Reorder the terms:
0.86 + -0.86 + 4.5x + x2 = 0 + -0.86

Combine like terms: 0.86 + -0.86 = 0.00
0.00 + 4.5x + x2 = 0 + -0.86
4.5x + x2 = 0 + -0.86

Combine like terms: 0 + -0.86 = -0.86
4.5x + x2 = -0.86

The x term is 4.5x.  Take half its coefficient (2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
4.5x + 5.0625 + x2 = -0.86 + 5.0625

Reorder the terms:
5.0625 + 4.5x + x2 = -0.86 + 5.0625

Combine like terms: -0.86 + 5.0625 = 4.2025
5.0625 + 4.5x + x2 = 4.2025

Factor a perfect square on the left side:
(x + 2.25)(x + 2.25) = 4.2025

Calculate the square root of the right side: 2.05

Break this problem into two subproblems by setting 
(x + 2.25) equal to 2.05 and -2.05.

Subproblem 1

x + 2.25 = 2.05 Simplifying x + 2.25 = 2.05 Reorder the terms: 2.25 + x = 2.05 Solving 2.25 + x = 2.05 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.25' to each side of the equation. 2.25 + -2.25 + x = 2.05 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + x = 2.05 + -2.25 x = 2.05 + -2.25 Combine like terms: 2.05 + -2.25 = -0.2 x = -0.2 Simplifying x = -0.2

Subproblem 2

x + 2.25 = -2.05 Simplifying x + 2.25 = -2.05 Reorder the terms: 2.25 + x = -2.05 Solving 2.25 + x = -2.05 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.25' to each side of the equation. 2.25 + -2.25 + x = -2.05 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + x = -2.05 + -2.25 x = -2.05 + -2.25 Combine like terms: -2.05 + -2.25 = -4.3 x = -4.3 Simplifying x = -4.3

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.2, -4.3}

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