Question

help me with this question given that g(y) = y^2-1, Find g(a-1).

Answer 1

=(a-1)^2 -1
=a(a-2)

Answer 2

put (a-1) in place of y
(a-1)^2-1=a^2-2a+1-1=a^2-2a

Answer 3

thanks alot..:0

Answer 4

At least Arnab09 provided some kind of explanation. I would have rather given the poster a chance to solve it himself. Saying " put (a-1) in place of y" was a good enough hint.

Answer 5

G(x)=5x-2 Sub y for f(x)
y=5x-2 Switch the x and y
x=5y-2 Solve for y
x+2=5y
1/5x+2/5=y Sub f^-1(x) for y
f^-1(x)=1/5x+2/5

Answer 6

@Rohangrr , Is there a meaningful reason for post that?

Answer 7

@Hero yes