F (x + 1) = 2x square - 3x + 1, find f (- 1), f (x-1)

F (x + 1) = 2x square - 3x + 1, find f (- 1), f (x-1)

Let x + 1 = t
Then x = T-1
F (T) = 2 (t-1) square-3 (t-1) + 1 = 2T square-7t + 6
So f (x) = 2x square - 7x + 6
f(-1)=15
F (x-1) = 2x square - 11x + 8