In a certain year, a magnitude 7.6 earthquake struck California. In another year, a magnitude 5.6 earthquake struck North Dakota. How many times as intense as the North Dakota quake was the California quake?

(n^3 - n)

= n(n-1)(n+1)

since it is divisible by 3 and 2 ,because it is a multiple 3 consecutive number

if, n-1 is odd then n+1 is also odd, then it is a multiple of 9

but if, n-1 is even then n+1 is also even, then it is a multiple of 4

so, largest multiple = max(9*2, 4*3) = max(18, 12) = 18

80x^8−68x^6+16^5−20x^4−4x^3+8x^2

hope i'm right lol