f(x) = x^4-6x^9+4
f(x)' = 4x^3-54x^8
x=1
f(1)' = 4*1^3-54*1^8 = 4-54 = -50
x=2
f(2)' = 4*8-54*256 = 32-13824 = -13792
ответ: f(1)' = -50 ; f(2)' = -13792
