(x+.9)(x+1.1)=0

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Solution for (x+.9)(x+1.1)=0 equation:


Simplifying
(x + 0.9)(x + 1.1) = 0

Reorder the terms:
(0.9 + x)(x + 1.1) = 0

Reorder the terms:
(0.9 + x)(1.1 + x) = 0

Multiply (0.9 + x) * (1.1 + x)
(0.9(1.1 + x) + x(1.1 + x)) = 0
((1.1 * 0.9 + x * 0.9) + x(1.1 + x)) = 0
((0.99 + 0.9x) + x(1.1 + x)) = 0
(0.99 + 0.9x + (1.1 * x + x * x)) = 0
(0.99 + 0.9x + (1.1x + x2)) = 0

Combine like terms: 0.9x + 1.1x = 2x
(0.99 + 2x + x2) = 0

Solving
0.99 + 2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-0.99' to each side of the equation.
0.99 + 2x + -0.99 + x2 = 0 + -0.99

Reorder the terms:
0.99 + -0.99 + 2x + x2 = 0 + -0.99

Combine like terms: 0.99 + -0.99 = 0.00
0.00 + 2x + x2 = 0 + -0.99
2x + x2 = 0 + -0.99

Combine like terms: 0 + -0.99 = -0.99
2x + x2 = -0.99

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = -0.99 + 1

Reorder the terms:
1 + 2x + x2 = -0.99 + 1

Combine like terms: -0.99 + 1 = 0.01
1 + 2x + x2 = 0.01

Factor a perfect square on the left side:
(x + 1)(x + 1) = 0.01

Calculate the square root of the right side: 0.1

Break this problem into two subproblems by setting 
(x + 1) equal to 0.1 and -0.1.

Subproblem 1

x + 1 = 0.1 Simplifying x + 1 = 0.1 Reorder the terms: 1 + x = 0.1 Solving 1 + x = 0.1 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 0.1 + -1 Combine like terms: 1 + -1 = 0 0 + x = 0.1 + -1 x = 0.1 + -1 Combine like terms: 0.1 + -1 = -0.9 x = -0.9 Simplifying x = -0.9

Subproblem 2

x + 1 = -0.1 Simplifying x + 1 = -0.1 Reorder the terms: 1 + x = -0.1 Solving 1 + x = -0.1 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -0.1 + -1 Combine like terms: 1 + -1 = 0 0 + x = -0.1 + -1 x = -0.1 + -1 Combine like terms: -0.1 + -1 = -1.1 x = -1.1 Simplifying x = -1.1

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.9, -1.1}

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