Jika di ketahui Df ={-3, -2, -1, 1, 2, 3}. Tentukan Rf dengan f(x) = x2 – 2x – 8!
Jika di ketahui Df ={-3, -2, -1, 1, 2, 3}. Tentukan Rf dengan f(x) = x2 – 2x – 8!
Pembahasan:
Df ={-3, -2, -1, 1, 2, 3}.
f(x) = x2 – 2x – 8
- f(-3) = (-3)2 – 2(-3) – 8 = 9 + 6 – 8 = 7
- f(-2) = (-2)2 – 2(-2) – 8 = 4 + 4 – 8 = 0
- f(-1) = (-1)2 – 2(-1) – 8 = 1 + 2 – 8 = -5
- f(0) = (0)2 – 2(0) – 8 = 0 + 0 – 8 = -8
- f(1) = (1)2 – 2(1) – 8 = 1 – 2 – 8 = -9
- f(2) = (2)2 – 2(2) – 8 = 4 – 4 – 8 = -8
- f(3) = (3)2 – 2(3) – 8 = 9 – 6 – 8 = -5
Jadi Rf = {-9, -8, -5 , 0, 7}
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