(x+1)(x+2)=28

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Solution for (x+1)(x+2)=28 equation:


Simplifying
(x + 1)(x + 2) = 28

Reorder the terms:
(1 + x)(x + 2) = 28

Reorder the terms:
(1 + x)(2 + x) = 28

Multiply (1 + x) * (2 + x)
(1(2 + x) + x(2 + x)) = 28
((2 * 1 + x * 1) + x(2 + x)) = 28
((2 + 1x) + x(2 + x)) = 28
(2 + 1x + (2 * x + x * x)) = 28
(2 + 1x + (2x + x2)) = 28

Combine like terms: 1x + 2x = 3x
(2 + 3x + x2) = 28

Solving
2 + 3x + x2 = 28

Solving for variable 'x'.

Reorder the terms:
2 + -28 + 3x + x2 = 28 + -28

Combine like terms: 2 + -28 = -26
-26 + 3x + x2 = 28 + -28

Combine like terms: 28 + -28 = 0
-26 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '26' to each side of the equation.
-26 + 3x + 26 + x2 = 0 + 26

Reorder the terms:
-26 + 26 + 3x + x2 = 0 + 26

Combine like terms: -26 + 26 = 0
0 + 3x + x2 = 0 + 26
3x + x2 = 0 + 26

Combine like terms: 0 + 26 = 26
3x + x2 = 26

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 = 26 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 26 + 2.25

Combine like terms: 26 + 2.25 = 28.25
2.25 + 3x + x2 = 28.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 28.25

Calculate the square root of the right side: 5.315072906

Break this problem into two subproblems by setting 
(x + 1.5) equal to 5.315072906 and -5.315072906.

Subproblem 1

x + 1.5 = 5.315072906 Simplifying x + 1.5 = 5.315072906 Reorder the terms: 1.5 + x = 5.315072906 Solving 1.5 + x = 5.315072906 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 = 5.315072906 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 5.315072906 + -1.5 x = 5.315072906 + -1.5 Combine like terms: 5.315072906 + -1.5 = 3.815072906 x = 3.815072906 Simplifying x = 3.815072906

Subproblem 2

x + 1.5 = -5.315072906 Simplifying x + 1.5 = -5.315072906 Reorder the terms: 1.5 + x = -5.315072906 Solving 1.5 + x = -5.315072906 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 = -5.315072906 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -5.315072906 + -1.5 x = -5.315072906 + -1.5 Combine like terms: -5.315072906 + -1.5 = -6.815072906 x = -6.815072906 Simplifying x = -6.815072906

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.815072906, -6.815072906}

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