(n+1)(n-5)=36

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Solution for (n+1)(n-5)=36 equation:


Simplifying
(n + 1)(n + -5) = 36

Reorder the terms:
(1 + n)(n + -5) = 36

Reorder the terms:
(1 + n)(-5 + n) = 36

Multiply (1 + n) * (-5 + n)
(1(-5 + n) + n(-5 + n)) = 36
((-5 * 1 + n * 1) + n(-5 + n)) = 36
((-5 + 1n) + n(-5 + n)) = 36
(-5 + 1n + (-5 * n + n * n)) = 36
(-5 + 1n + (-5n + n2)) = 36

Combine like terms: 1n + -5n = -4n
(-5 + -4n + n2) = 36

Solving
-5 + -4n + n2 = 36

Solving for variable 'n'.

Reorder the terms:
-5 + -36 + -4n + n2 = 36 + -36

Combine like terms: -5 + -36 = -41
-41 + -4n + n2 = 36 + -36

Combine like terms: 36 + -36 = 0
-41 + -4n + n2 = 0

Begin completing the square.

Move the constant term to the right:

Add '41' to each side of the equation.
-41 + -4n + 41 + n2 = 0 + 41

Reorder the terms:
-41 + 41 + -4n + n2 = 0 + 41

Combine like terms: -41 + 41 = 0
0 + -4n + n2 = 0 + 41
-4n + n2 = 0 + 41

Combine like terms: 0 + 41 = 41
-4n + n2 = 41

The n term is -4n.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4n + 4 + n2 = 41 + 4

Reorder the terms:
4 + -4n + n2 = 41 + 4

Combine like terms: 41 + 4 = 45
4 + -4n + n2 = 45

Factor a perfect square on the left side:
(n + -2)(n + -2) = 45

Calculate the square root of the right side: 6.708203933

Break this problem into two subproblems by setting 
(n + -2) equal to 6.708203933 and -6.708203933.

Subproblem 1

n + -2 = 6.708203933 Simplifying n + -2 = 6.708203933 Reorder the terms: -2 + n = 6.708203933 Solving -2 + n = 6.708203933 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + n = 6.708203933 + 2 Combine like terms: -2 + 2 = 0 0 + n = 6.708203933 + 2 n = 6.708203933 + 2 Combine like terms: 6.708203933 + 2 = 8.708203933 n = 8.708203933 Simplifying n = 8.708203933

Subproblem 2

n + -2 = -6.708203933 Simplifying n + -2 = -6.708203933 Reorder the terms: -2 + n = -6.708203933 Solving -2 + n = -6.708203933 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + n = -6.708203933 + 2 Combine like terms: -2 + 2 = 0 0 + n = -6.708203933 + 2 n = -6.708203933 + 2 Combine like terms: -6.708203933 + 2 = -4.708203933 n = -4.708203933 Simplifying n = -4.708203933

Solution

The solution to the problem is based on the solutions from the subproblems. n = {8.708203933, -4.708203933}

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