dik f(x)=x^2+4x-5 g(x)=2x-1 tentukan (fog)(x), (fog)(2), (gof)(x), (gof)(2)

Fog (x) = (2x - 1 )^2 + 4(2x -1) - 5
= 2x^2 - 4x + 1 + 8x - 4 - 5
= 2x^2 + 4x - 8
Fog (2) = 2(2)^2 + 4(2) - 8
= 8 + 8 - 8
= 8
Gof (x) = 2 ( x^2 +4x - 5 ) -1
= 2x^2 + 8x - 11
Gof (2) = 2(2)^2 + 2(8) - 11
= 8 + 16 - 11
= 13.