(x+5)(x+3)=28

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Solution for (x+5)(x+3)=28 equation:


Simplifying
(x + 5)(x + 3) = 28

Reorder the terms:
(5 + x)(x + 3) = 28

Reorder the terms:
(5 + x)(3 + x) = 28

Multiply (5 + x) * (3 + x)
(5(3 + x) + x(3 + x)) = 28
((3 * 5 + x * 5) + x(3 + x)) = 28
((15 + 5x) + x(3 + x)) = 28
(15 + 5x + (3 * x + x * x)) = 28
(15 + 5x + (3x + x2)) = 28

Combine like terms: 5x + 3x = 8x
(15 + 8x + x2) = 28

Solving
15 + 8x + x2 = 28

Solving for variable 'x'.

Reorder the terms:
15 + -28 + 8x + x2 = 28 + -28

Combine like terms: 15 + -28 = -13
-13 + 8x + x2 = 28 + -28

Combine like terms: 28 + -28 = 0
-13 + 8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '13' to each side of the equation.
-13 + 8x + 13 + x2 = 0 + 13

Reorder the terms:
-13 + 13 + 8x + x2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + 8x + x2 = 0 + 13
8x + x2 = 0 + 13

Combine like terms: 0 + 13 = 13
8x + x2 = 13

The x term is 8x.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x + 16 + x2 = 13 + 16

Reorder the terms:
16 + 8x + x2 = 13 + 16

Combine like terms: 13 + 16 = 29
16 + 8x + x2 = 29

Factor a perfect square on the left side:
(x + 4)(x + 4) = 29

Calculate the square root of the right side: 5.385164807

Break this problem into two subproblems by setting 
(x + 4) equal to 5.385164807 and -5.385164807.

Subproblem 1

x + 4 = 5.385164807 Simplifying x + 4 = 5.385164807 Reorder the terms: 4 + x = 5.385164807 Solving 4 + x = 5.385164807 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 5.385164807 + -4 Combine like terms: 4 + -4 = 0 0 + x = 5.385164807 + -4 x = 5.385164807 + -4 Combine like terms: 5.385164807 + -4 = 1.385164807 x = 1.385164807 Simplifying x = 1.385164807

Subproblem 2

x + 4 = -5.385164807 Simplifying x + 4 = -5.385164807 Reorder the terms: 4 + x = -5.385164807 Solving 4 + x = -5.385164807 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = -5.385164807 + -4 Combine like terms: 4 + -4 = 0 0 + x = -5.385164807 + -4 x = -5.385164807 + -4 Combine like terms: -5.385164807 + -4 = -9.385164807 x = -9.385164807 Simplifying x = -9.385164807

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.385164807, -9.385164807}

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