(X+5)(X+1)=20

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Solution for (X+5)(X+1)=20 equation:


Simplifying
(X + 5)(X + 1) = 20

Reorder the terms:
(5 + X)(X + 1) = 20

Reorder the terms:
(5 + X)(1 + X) = 20

Multiply (5 + X) * (1 + X)
(5(1 + X) + X(1 + X)) = 20
((1 * 5 + X * 5) + X(1 + X)) = 20
((5 + 5X) + X(1 + X)) = 20
(5 + 5X + (1 * X + X * X)) = 20
(5 + 5X + (1X + X2)) = 20

Combine like terms: 5X + 1X = 6X
(5 + 6X + X2) = 20

Solving
5 + 6X + X2 = 20

Solving for variable 'X'.

Reorder the terms:
5 + -20 + 6X + X2 = 20 + -20

Combine like terms: 5 + -20 = -15
-15 + 6X + X2 = 20 + -20

Combine like terms: 20 + -20 = 0
-15 + 6X + X2 = 0

Begin completing the square.

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + 6X + 15 + X2 = 0 + 15

Reorder the terms:
-15 + 15 + 6X + X2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + 6X + X2 = 0 + 15
6X + X2 = 0 + 15

Combine like terms: 0 + 15 = 15
6X + X2 = 15

The X term is 6X.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6X + 9 + X2 = 15 + 9

Reorder the terms:
9 + 6X + X2 = 15 + 9

Combine like terms: 15 + 9 = 24
9 + 6X + X2 = 24

Factor a perfect square on the left side:
(X + 3)(X + 3) = 24

Calculate the square root of the right side: 4.898979486

Break this problem into two subproblems by setting 
(X + 3) equal to 4.898979486 and -4.898979486.

Subproblem 1

X + 3 = 4.898979486 Simplifying X + 3 = 4.898979486 Reorder the terms: 3 + X = 4.898979486 Solving 3 + X = 4.898979486 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + X = 4.898979486 + -3 Combine like terms: 3 + -3 = 0 0 + X = 4.898979486 + -3 X = 4.898979486 + -3 Combine like terms: 4.898979486 + -3 = 1.898979486 X = 1.898979486 Simplifying X = 1.898979486

Subproblem 2

X + 3 = -4.898979486 Simplifying X + 3 = -4.898979486 Reorder the terms: 3 + X = -4.898979486 Solving 3 + X = -4.898979486 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + X = -4.898979486 + -3 Combine like terms: 3 + -3 = 0 0 + X = -4.898979486 + -3 X = -4.898979486 + -3 Combine like terms: -4.898979486 + -3 = -7.898979486 X = -7.898979486 Simplifying X = -7.898979486

Solution

The solution to the problem is based on the solutions from the subproblems. X = {1.898979486, -7.898979486}

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