(x+5)(x+2)=26

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Solution for (x+5)(x+2)=26 equation:


Simplifying
(x + 5)(x + 2) = 26

Reorder the terms:
(5 + x)(x + 2) = 26

Reorder the terms:
(5 + x)(2 + x) = 26

Multiply (5 + x) * (2 + x)
(5(2 + x) + x(2 + x)) = 26
((2 * 5 + x * 5) + x(2 + x)) = 26
((10 + 5x) + x(2 + x)) = 26
(10 + 5x + (2 * x + x * x)) = 26
(10 + 5x + (2x + x2)) = 26

Combine like terms: 5x + 2x = 7x
(10 + 7x + x2) = 26

Solving
10 + 7x + x2 = 26

Solving for variable 'x'.

Reorder the terms:
10 + -26 + 7x + x2 = 26 + -26

Combine like terms: 10 + -26 = -16
-16 + 7x + x2 = 26 + -26

Combine like terms: 26 + -26 = 0
-16 + 7x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + 7x + 16 + x2 = 0 + 16

Reorder the terms:
-16 + 16 + 7x + x2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 7x + x2 = 0 + 16
7x + x2 = 0 + 16

Combine like terms: 0 + 16 = 16
7x + x2 = 16

The x term is 7x.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7x + 12.25 + x2 = 16 + 12.25

Reorder the terms:
12.25 + 7x + x2 = 16 + 12.25

Combine like terms: 16 + 12.25 = 28.25
12.25 + 7x + x2 = 28.25

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 28.25

Calculate the square root of the right side: 5.315072906

Break this problem into two subproblems by setting 
(x + 3.5) equal to 5.315072906 and -5.315072906.

Subproblem 1

x + 3.5 = 5.315072906 Simplifying x + 3.5 = 5.315072906 Reorder the terms: 3.5 + x = 5.315072906 Solving 3.5 + x = 5.315072906 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = 5.315072906 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 5.315072906 + -3.5 x = 5.315072906 + -3.5 Combine like terms: 5.315072906 + -3.5 = 1.815072906 x = 1.815072906 Simplifying x = 1.815072906

Subproblem 2

x + 3.5 = -5.315072906 Simplifying x + 3.5 = -5.315072906 Reorder the terms: 3.5 + x = -5.315072906 Solving 3.5 + x = -5.315072906 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = -5.315072906 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -5.315072906 + -3.5 x = -5.315072906 + -3.5 Combine like terms: -5.315072906 + -3.5 = -8.815072906 x = -8.815072906 Simplifying x = -8.815072906

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.815072906, -8.815072906}

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