jika f(x)=x²-1 dan g(x)=2x+3 tentukan fog (x) dan gof(x)?

@ fog(x)= f(g(x))
= f(2x+3)
= (2x+3)²-1
= 4x²+12+8
@ gof(x) = g(f(x))
= g(x²-1)
= 2(x²-1)+3
= 2x²-2+3
= 2x²+1