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1. f(x) = 3x-4 ditanya inversnya.
y = 3x -4
3x = y+4
x = (y+4)/3 , jadi f^-1(x) = (x+4)/3
2. f(x) = (2x+1)/(3x-5) ditanya inversnya
y = (2x+1) / (3x-5)
3xy-5y = 2x + 1
3xy-2x = 5y +1
x(3y-2) = 5y + 1
x = (5y + 1) / (3y - 2) , jadi f^-1(x) = (5x + 1) / (3x-2)
3. Dik :
f(x) = 2x + 1
g(x) = x²-2x+2
Dit : (f o g)(x)
jawab : (f o g)(x) = f(g(x)) = 2(g(x)) + 1
= 2(x²-2x+2) + 1 = 2x² -4x +5
Jadi (f o g)(x) = 2x²-4x+5
4. Dik : f(x) = 2x² + 3 dan g(x) = 4x-3
Dit : (g o f )(-2) = . . . ?
(g o f) (x) = g(f(x)) = 4(f(x)) - 3
= 4 (2x²+3) - 3 = 8x² + 9
untuk x = -2 maka
(g o f)(-2) = 8 (-2)² + 9 = 41
5. Dik : f(x) = 2x - 5 dan g(x) = x² - 3x
Dit : (f o g)(x) = . . .?
(f o g)(x) = f(g(x)) = 2(g(x)) - 5
= 2(x²-3x) - 5 = 2x² - 6x - 5
Mudah2an membantu
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