What is the sum of -3x2 - 7x + 9 and -5x² + 6x – 4?

-8x^2-x+5

Step-by-step explanation:

hope this helps! ^w^

(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

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