Answer:
n = 5
Explanation:
5n + 7 (n+4) = 88
Distribute the 7
5n + 7n + 28 = 88
Combine like terms (5n, 7n)
12n + 28 = 88
Subtract 28 from 88 to isolate the exponent (12n)
12n = 60
Divide both sides by 12
n = 5
--
To check the answer, replace n in the equation with 5.
5 * 5 + 7 (5 + 4) = 88
5 * 5 + 7 * 9 = 88
25 + 63 = 88
88 = 88