If f(x) = 2x - 4, then prove that, (f-1of)(x) is an identify function. it's a optional mathematics Questions please solve him​

f(x)=2x-4

f(1)=2(1)-4

=2-4

f(1)=-2

(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

incomplete question. how do you expect anyone to you when you do not post the question in its entirety?