(x+2)(x+1)=3

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


Simplifying
(x + 2)(x + 1) = 3

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

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

Multiply (2 + x) * (1 + x)
(2(1 + x) + x(1 + x)) = 3
((1 * 2 + x * 2) + x(1 + x)) = 3
((2 + 2x) + x(1 + x)) = 3
(2 + 2x + (1 * x + x * x)) = 3
(2 + 2x + (1x + x2)) = 3

Combine like terms: 2x + 1x = 3x
(2 + 3x + x2) = 3

Solving
2 + 3x + x2 = 3

Solving for variable 'x'.

Reorder the terms:
2 + -3 + 3x + x2 = 3 + -3

Combine like terms: 2 + -3 = -1
-1 + 3x + x2 = 3 + -3

Combine like terms: 3 + -3 = 0
-1 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 3x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + 3x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 3x + x2 = 0 + 1
3x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
3x + x2 = 1

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 1 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 1 + 2.25

Combine like terms: 1 + 2.25 = 3.25
2.25 + 3x + x2 = 3.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 3.25

Calculate the square root of the right side: 1.802775638

Break this problem into two subproblems by setting 
(x + 1.5) equal to 1.802775638 and -1.802775638.

Subproblem 1

x + 1.5 = 1.802775638 Simplifying x + 1.5 = 1.802775638 Reorder the terms: 1.5 + x = 1.802775638 Solving 1.5 + x = 1.802775638 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 1.802775638 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 1.802775638 + -1.5 x = 1.802775638 + -1.5 Combine like terms: 1.802775638 + -1.5 = 0.302775638 x = 0.302775638 Simplifying x = 0.302775638

Subproblem 2

x + 1.5 = -1.802775638 Simplifying x + 1.5 = -1.802775638 Reorder the terms: 1.5 + x = -1.802775638 Solving 1.5 + x = -1.802775638 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -1.802775638 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -1.802775638 + -1.5 x = -1.802775638 + -1.5 Combine like terms: -1.802775638 + -1.5 = -3.302775638 x = -3.302775638 Simplifying x = -3.302775638

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.302775638, -3.302775638}

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