0.4(x-1)(x-5)=0

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Solution for 0.4(x-1)(x-5)=0 equation:


Simplifying
0.4(x + -1)(x + -5) = 0

Reorder the terms:
0.4(-1 + x)(x + -5) = 0

Reorder the terms:
0.4(-1 + x)(-5 + x) = 0

Multiply (-1 + x) * (-5 + x)
0.4(-1(-5 + x) + x(-5 + x)) = 0
0.4((-5 * -1 + x * -1) + x(-5 + x)) = 0
0.4((5 + -1x) + x(-5 + x)) = 0
0.4(5 + -1x + (-5 * x + x * x)) = 0
0.4(5 + -1x + (-5x + x2)) = 0

Combine like terms: -1x + -5x = -6x
0.4(5 + -6x + x2) = 0
(5 * 0.4 + -6x * 0.4 + x2 * 0.4) = 0
(2 + -2.4x + 0.4x2) = 0

Solving
2 + -2.4x + 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'.
5 + -6x + x2 = 0

Move the constant term to the right:

Add '-5' to each side of the equation.
5 + -6x + -5 + x2 = 0 + -5

Reorder the terms:
5 + -5 + -6x + x2 = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -6x + x2 = 0 + -5
-6x + x2 = 0 + -5

Combine like terms: 0 + -5 = -5
-6x + x2 = -5

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = -5 + 9

Reorder the terms:
9 + -6x + x2 = -5 + 9

Combine like terms: -5 + 9 = 4
9 + -6x + x2 = 4

Factor a perfect square on the left side:
(x + -3)(x + -3) = 4

Calculate the square root of the right side: 2

Break this problem into two subproblems by setting 
(x + -3) equal to 2 and -2.

Subproblem 1

x + -3 = 2 Simplifying x + -3 = 2 Reorder the terms: -3 + x = 2 Solving -3 + x = 2 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 2 + 3 Combine like terms: -3 + 3 = 0 0 + x = 2 + 3 x = 2 + 3 Combine like terms: 2 + 3 = 5 x = 5 Simplifying x = 5

Subproblem 2

x + -3 = -2 Simplifying x + -3 = -2 Reorder the terms: -3 + x = -2 Solving -3 + x = -2 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -2 + 3 Combine like terms: -3 + 3 = 0 0 + x = -2 + 3 x = -2 + 3 Combine like terms: -2 + 3 = 1 x = 1 Simplifying x = 1

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5, 1}

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