(x+0.25)(x+0.8)=0

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Solution for (x+0.25)(x+0.8)=0 equation:


Simplifying
(x + 0.25)(x + 0.8) = 0

Reorder the terms:
(0.25 + x)(x + 0.8) = 0

Reorder the terms:
(0.25 + x)(0.8 + x) = 0

Multiply (0.25 + x) * (0.8 + x)
(0.25(0.8 + x) + x(0.8 + x)) = 0
((0.8 * 0.25 + x * 0.25) + x(0.8 + x)) = 0
((0.2 + 0.25x) + x(0.8 + x)) = 0
(0.2 + 0.25x + (0.8 * x + x * x)) = 0
(0.2 + 0.25x + (0.8x + x2)) = 0

Combine like terms: 0.25x + 0.8x = 1.05x
(0.2 + 1.05x + x2) = 0

Solving
0.2 + 1.05x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-0.2' to each side of the equation.
0.2 + 1.05x + -0.2 + x2 = 0 + -0.2

Reorder the terms:
0.2 + -0.2 + 1.05x + x2 = 0 + -0.2

Combine like terms: 0.2 + -0.2 = 0.0
0.0 + 1.05x + x2 = 0 + -0.2
1.05x + x2 = 0 + -0.2

Combine like terms: 0 + -0.2 = -0.2
1.05x + x2 = -0.2

The x term is 1.05x.  Take half its coefficient (0.525).
Square it (0.275625) and add it to both sides.

Add '0.275625' to each side of the equation.
1.05x + 0.275625 + x2 = -0.2 + 0.275625

Reorder the terms:
0.275625 + 1.05x + x2 = -0.2 + 0.275625

Combine like terms: -0.2 + 0.275625 = 0.075625
0.275625 + 1.05x + x2 = 0.075625

Factor a perfect square on the left side:
(x + 0.525)(x + 0.525) = 0.075625

Calculate the square root of the right side: 0.275

Break this problem into two subproblems by setting 
(x + 0.525) equal to 0.275 and -0.275.

Subproblem 1

x + 0.525 = 0.275 Simplifying x + 0.525 = 0.275 Reorder the terms: 0.525 + x = 0.275 Solving 0.525 + x = 0.275 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.525' to each side of the equation. 0.525 + -0.525 + x = 0.275 + -0.525 Combine like terms: 0.525 + -0.525 = 0.000 0.000 + x = 0.275 + -0.525 x = 0.275 + -0.525 Combine like terms: 0.275 + -0.525 = -0.25 x = -0.25 Simplifying x = -0.25

Subproblem 2

x + 0.525 = -0.275 Simplifying x + 0.525 = -0.275 Reorder the terms: 0.525 + x = -0.275 Solving 0.525 + x = -0.275 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.525' to each side of the equation. 0.525 + -0.525 + x = -0.275 + -0.525 Combine like terms: 0.525 + -0.525 = 0.000 0.000 + x = -0.275 + -0.525 x = -0.275 + -0.525 Combine like terms: -0.275 + -0.525 = -0.8 x = -0.8 Simplifying x = -0.8

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.25, -0.8}

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