(n+4)(n-5)=36

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Solution for (n+4)(n-5)=36 equation:


Simplifying
(n + 4)(n + -5) = 36

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

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

Multiply (4 + n) * (-5 + n)
(4(-5 + n) + n(-5 + n)) = 36
((-5 * 4 + n * 4) + n(-5 + n)) = 36
((-20 + 4n) + n(-5 + n)) = 36
(-20 + 4n + (-5 * n + n * n)) = 36
(-20 + 4n + (-5n + n2)) = 36

Combine like terms: 4n + -5n = -1n
(-20 + -1n + n2) = 36

Solving
-20 + -1n + n2 = 36

Solving for variable 'n'.

Reorder the terms:
-20 + -36 + -1n + n2 = 36 + -36

Combine like terms: -20 + -36 = -56
-56 + -1n + n2 = 36 + -36

Combine like terms: 36 + -36 = 0
-56 + -1n + n2 = 0

Factor a trinomial.
(-7 + -1n)(8 + -1n) = 0

Subproblem 1

Set the factor '(-7 + -1n)' equal to zero and attempt to solve: Simplifying -7 + -1n = 0 Solving -7 + -1n = 0 Move all terms containing n to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -1n = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -1n = 0 + 7 -1n = 0 + 7 Combine like terms: 0 + 7 = 7 -1n = 7 Divide each side by '-1'. n = -7 Simplifying n = -7

Subproblem 2

Set the factor '(8 + -1n)' equal to zero and attempt to solve: Simplifying 8 + -1n = 0 Solving 8 + -1n = 0 Move all terms containing n to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -1n = 0 + -8 Combine like terms: 8 + -8 = 0 0 + -1n = 0 + -8 -1n = 0 + -8 Combine like terms: 0 + -8 = -8 -1n = -8 Divide each side by '-1'. n = 8 Simplifying n = 8

Solution

n = {-7, 8}

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