Dik:
f(x) = x² + 4x -5
g(x) = 2x-1
dit : (f o g)(2) … ???
(komposisi )
Jawaban Terkonfirmasi
(fog)(x)=f(g(x))
=(2x-1)^2 + 4(2x-1) -5
=(4x^2 -4x +1) +(8x -4) -5
=4x^2 +4x -8
(fog)(2)= 4(2)^2 +4(2) -5
= 16 + 8 -5
= 19
F(g(x) = f(2(x)-1)=
(2x-1)² + 4(2x-1)-5
4x²-2x+1 + 8x-4-5
4x² + 6x – 8 =
4(2)² + 6(2) – 8=
4.4 + 12- 8 = 16 + 12 – 8= 20