768,384,192 what would the explicit formula be ? a7=

7,11,15,19 what would be the explicit formula ? a11=

a7 = 12,  a11= 47

Step-by-step explanation:

768, 384, 192, 96, 48, 24, 12

a(n) = 768 / (2∧X - 1)

a(7) = 768 / 2∧6 = 768 / 64 = 12

7, 11, 15, 19 23, 17, 31, 35, 39, 43, 47

a(n) = 7 + 4 * (X-1)

a(11) = 7 + 4 * (11-1) = 7 + 40 =47

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the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8