(0.6x-3)(2x+1)=0

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Solution for (0.6x-3)(2x+1)=0 equation: 


Simplifying
(0.6x + -3)(2x + 1) = 0

Reorder the terms:
(-3 + 0.6x)(2x + 1) = 0

Reorder the terms:
(-3 + 0.6x)(1 + 2x) = 0

Multiply (-3 + 0.6x) * (1 + 2x)
(-3(1 + 2x) + 0.6x * (1 + 2x)) = 0
((1 * -3 + 2x * -3) + 0.6x * (1 + 2x)) = 0
((-3 + -6x) + 0.6x * (1 + 2x)) = 0
(-3 + -6x + (1 * 0.6x + 2x * 0.6x)) = 0
(-3 + -6x + (0.6x + 1.2x2)) = 0

Combine like terms: -6x + 0.6x = -5.4x
(-3 + -5.4x + 1.2x2) = 0

Solving
-3 + -5.4x + 1.2x2 = 0

Solving for variable 'x'.

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

Divide each side by '1.2'.
-2.5 + -4.5x + x2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -4.5x + 2.5 + x2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -4.5x + x2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -4.5x + x2 = 0 + 2.5
-4.5x + x2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-4.5x + x2 = 2.5

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 = 2.5 + 5.0625

Reorder the terms:
5.0625 + -4.5x + x2 = 2.5 + 5.0625

Combine like terms: 2.5 + 5.0625 = 7.5625
5.0625 + -4.5x + x2 = 7.5625

Factor a perfect square on the left side:
(x + -2.25)(x + -2.25) = 7.5625

Calculate the square root of the right side: 2.75

Break this problem into two subproblems by setting 
(x + -2.25) equal to 2.75 and -2.75.


Subproblem 1
x + -2.25 = 2.75

Simplifying
x + -2.25 = 2.75

Reorder the terms:
-2.25 + x = 2.75

Solving
-2.25 + x = 2.75

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 = 2.75 + 2.25

Combine like terms: -2.25 + 2.25 = 0.00
0.00 + x = 2.75 + 2.25
x = 2.75 + 2.25

Combine like terms: 2.75 + 2.25 = 5
x = 5

Simplifying
x = 5


Subproblem 2
x + -2.25 = -2.75

Simplifying
x + -2.25 = -2.75

Reorder the terms:
-2.25 + x = -2.75

Solving
-2.25 + x = -2.75

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 = -2.75 + 2.25

Combine like terms: -2.25 + 2.25 = 0.00
0.00 + x = -2.75 + 2.25
x = -2.75 + 2.25

Combine like terms: -2.75 + 2.25 = -0.5
x = -0.5

Simplifying
x = -0.5


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {5, -0.5}

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