tentukan nilai dari g (-1) jika f(x)=3x-2 dan (fog)(x) =(x - 1)(2x+5)

Jawab:

f(x) = 3x - 2

fog(x)= (x - 1)(2x + 5)

3. g(x) - 2 = (x - 1)(2x + 5)

3. g(x) = (x - 1)(2x + 5) + 2

g(x) = 1/3 [ (x -1)(2x + 5) + 2 ]

g(-1) = 1/3  [ (-2)(3) + 2  ]

g(-1) = 1/3 ( - 4)

g(-1) = - 4/3