Simplify each expression.

-6a(-7b)

42ab

Step-by-step explanation:

To find the answer we need to simply multiply -6a by -7b.

6 * 7 = 42

- * - = +

a * b = ab

And we end up with a positive 42ab

(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