(2x+0.3)(0.5x+2)=0

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Solution for (2x+0.3)(0.5x+2)=0 equation:


Simplifying
(2x + 0.3)(0.5x + 2) = 0

Reorder the terms:
(0.3 + 2x)(0.5x + 2) = 0

Reorder the terms:
(0.3 + 2x)(2 + 0.5x) = 0

Multiply (0.3 + 2x) * (2 + 0.5x)
(0.3(2 + 0.5x) + 2x * (2 + 0.5x)) = 0
((2 * 0.3 + 0.5x * 0.3) + 2x * (2 + 0.5x)) = 0
((0.6 + 0.15x) + 2x * (2 + 0.5x)) = 0
(0.6 + 0.15x + (2 * 2x + 0.5x * 2x)) = 0
(0.6 + 0.15x + (4x + 1x2)) = 0

Combine like terms: 0.15x + 4x = 4.15x
(0.6 + 4.15x + 1x2) = 0

Solving
0.6 + 4.15x + 1x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-0.6' to each side of the equation.
0.6 + 4.15x + -0.6 + x2 = 0 + -0.6

Reorder the terms:
0.6 + -0.6 + 4.15x + x2 = 0 + -0.6

Combine like terms: 0.6 + -0.6 = 0.0
0.0 + 4.15x + x2 = 0 + -0.6
4.15x + x2 = 0 + -0.6

Combine like terms: 0 + -0.6 = -0.6
4.15x + x2 = -0.6

The x term is 4.15x.  Take half its coefficient (2.075).
Square it (4.305625) and add it to both sides.

Add '4.305625' to each side of the equation.
4.15x + 4.305625 + x2 = -0.6 + 4.305625

Reorder the terms:
4.305625 + 4.15x + x2 = -0.6 + 4.305625

Combine like terms: -0.6 + 4.305625 = 3.705625
4.305625 + 4.15x + x2 = 3.705625

Factor a perfect square on the left side:
(x + 2.075)(x + 2.075) = 3.705625

Calculate the square root of the right side: 1.925

Break this problem into two subproblems by setting 
(x + 2.075) equal to 1.925 and -1.925.

Subproblem 1

x + 2.075 = 1.925 Simplifying x + 2.075 = 1.925 Reorder the terms: 2.075 + x = 1.925 Solving 2.075 + x = 1.925 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.075' to each side of the equation. 2.075 + -2.075 + x = 1.925 + -2.075 Combine like terms: 2.075 + -2.075 = 0.000 0.000 + x = 1.925 + -2.075 x = 1.925 + -2.075 Combine like terms: 1.925 + -2.075 = -0.15 x = -0.15 Simplifying x = -0.15

Subproblem 2

x + 2.075 = -1.925 Simplifying x + 2.075 = -1.925 Reorder the terms: 2.075 + x = -1.925 Solving 2.075 + x = -1.925 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.075' to each side of the equation. 2.075 + -2.075 + x = -1.925 + -2.075 Combine like terms: 2.075 + -2.075 = 0.000 0.000 + x = -1.925 + -2.075 x = -1.925 + -2.075 Combine like terms: -1.925 + -2.075 = -4 x = -4 Simplifying x = -4

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.15, -4}

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