Dik : f(x)=2x²+1 Dan g(x)=7x-5 tentukan a. (fog) (1) Dan b. (Gof) (x)

(fog)(x) = f(g(x))
= 2(7x – 5)² + 1
= 2(49x² – 70x + 25) + 1
= 98x² – 140x + 50 + 1
= 98x² – 140x + 51

(fog)(1) = 98(1)² – 140(1) + 51
= 98 – 140 + 51
= 9

(gof)(x) = 7(2x² + 1) – 5
= 14x² + 7 – 5
= 14x² – 2