(.4x+.2)(x+.6)=

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Solution for (.4x+.2)(x+.6)= equation:


Simplifying
(0.4x + 0.2)(x + 0.6) = 0

Reorder the terms:
(0.2 + 0.4x)(x + 0.6) = 0

Reorder the terms:
(0.2 + 0.4x)(0.6 + x) = 0

Multiply (0.2 + 0.4x) * (0.6 + x)
(0.2(0.6 + x) + 0.4x * (0.6 + x)) = 0
((0.6 * 0.2 + x * 0.2) + 0.4x * (0.6 + x)) = 0
((0.12 + 0.2x) + 0.4x * (0.6 + x)) = 0
(0.12 + 0.2x + (0.6 * 0.4x + x * 0.4x)) = 0
(0.12 + 0.2x + (0.24x + 0.4x2)) = 0

Combine like terms: 0.2x + 0.24x = 0.44x
(0.12 + 0.44x + 0.4x2) = 0

Solving
0.12 + 0.44x + 0.4x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.4'.
0.3 + 1.1x + x2 = 0

Move the constant term to the right:

Add '-0.3' to each side of the equation.
0.3 + 1.1x + -0.3 + x2 = 0 + -0.3

Reorder the terms:
0.3 + -0.3 + 1.1x + x2 = 0 + -0.3

Combine like terms: 0.3 + -0.3 = 0.0
0.0 + 1.1x + x2 = 0 + -0.3
1.1x + x2 = 0 + -0.3

Combine like terms: 0 + -0.3 = -0.3
1.1x + x2 = -0.3

The x term is 1.1x.  Take half its coefficient (0.55).
Square it (0.3025) and add it to both sides.

Add '0.3025' to each side of the equation.
1.1x + 0.3025 + x2 = -0.3 + 0.3025

Reorder the terms:
0.3025 + 1.1x + x2 = -0.3 + 0.3025

Combine like terms: -0.3 + 0.3025 = 0.0025
0.3025 + 1.1x + x2 = 0.0025

Factor a perfect square on the left side:
(x + 0.55)(x + 0.55) = 0.0025

Calculate the square root of the right side: 0.05

Break this problem into two subproblems by setting 
(x + 0.55) equal to 0.05 and -0.05.

Subproblem 1

x + 0.55 = 0.05 Simplifying x + 0.55 = 0.05 Reorder the terms: 0.55 + x = 0.05 Solving 0.55 + x = 0.05 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.55' to each side of the equation. 0.55 + -0.55 + x = 0.05 + -0.55 Combine like terms: 0.55 + -0.55 = 0.00 0.00 + x = 0.05 + -0.55 x = 0.05 + -0.55 Combine like terms: 0.05 + -0.55 = -0.5 x = -0.5 Simplifying x = -0.5

Subproblem 2

x + 0.55 = -0.05 Simplifying x + 0.55 = -0.05 Reorder the terms: 0.55 + x = -0.05 Solving 0.55 + x = -0.05 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.55' to each side of the equation. 0.55 + -0.55 + x = -0.05 + -0.55 Combine like terms: 0.55 + -0.55 = 0.00 0.00 + x = -0.05 + -0.55 x = -0.05 + -0.55 Combine like terms: -0.05 + -0.55 = -0.6 x = -0.6 Simplifying x = -0.6

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.5, -0.6}

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