4(n+2)(n+5)=280

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Solution for 4(n+2)(n+5)=280 equation:


Simplifying
4(n + 2)(n + 5) = 280

Reorder the terms:
4(2 + n)(n + 5) = 280

Reorder the terms:
4(2 + n)(5 + n) = 280

Multiply (2 + n) * (5 + n)
4(2(5 + n) + n(5 + n)) = 280
4((5 * 2 + n * 2) + n(5 + n)) = 280
4((10 + 2n) + n(5 + n)) = 280
4(10 + 2n + (5 * n + n * n)) = 280
4(10 + 2n + (5n + n2)) = 280

Combine like terms: 2n + 5n = 7n
4(10 + 7n + n2) = 280
(10 * 4 + 7n * 4 + n2 * 4) = 280
(40 + 28n + 4n2) = 280

Solving
40 + 28n + 4n2 = 280

Solving for variable 'n'.

Reorder the terms:
40 + -280 + 28n + 4n2 = 280 + -280

Combine like terms: 40 + -280 = -240
-240 + 28n + 4n2 = 280 + -280

Combine like terms: 280 + -280 = 0
-240 + 28n + 4n2 = 0

Factor out the Greatest Common Factor (GCF), '4'.
4(-60 + 7n + n2) = 0

Factor a trinomial.
4((-12 + -1n)(5 + -1n)) = 0

Ignore the factor 4.

Subproblem 1

Set the factor '(-12 + -1n)' equal to zero and attempt to solve: Simplifying -12 + -1n = 0 Solving -12 + -1n = 0 Move all terms containing n to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + -1n = 0 + 12 Combine like terms: -12 + 12 = 0 0 + -1n = 0 + 12 -1n = 0 + 12 Combine like terms: 0 + 12 = 12 -1n = 12 Divide each side by '-1'. n = -12 Simplifying n = -12

Subproblem 2

Set the factor '(5 + -1n)' equal to zero and attempt to solve: Simplifying 5 + -1n = 0 Solving 5 + -1n = 0 Move all terms containing n to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -1n = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -1n = 0 + -5 -1n = 0 + -5 Combine like terms: 0 + -5 = -5 -1n = -5 Divide each side by '-1'. n = 5 Simplifying n = 5

Solution

n = {-12, 5}

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