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15 = 2n + 10
2n = 15 - 10
= 5
n= 2 1/2
p(-n) = -(2n + 10)
11 = -2n -10
2n = -21
n = -10 1/2
jika diketahui :
a. p (n) = 15
maka
⇨15 = 2n + 10
⇨2n = 15-10
⇨2n = 5
⇨n = 5/2
b. p (-n) = 11
maka
⇨11 = 2(-n) + 10
⇨-2n = 11-10
⇨-2n = 1
⇨ n = -1/2