please dijawab segera

P(n) = 2n +10. p(n) = 15
2n +10 = 15
2n = 15 - 10
2n = 5
n = 5/2 = 2 1/2
p(-n) = 11
2(-n) + 10 = 11
-2n = 11 - 10
-2n = 1
n = -1/2
5) I (x) = 1/2 x^2 - 2
I (0) = 1/2(0)^2 - 2
= -2
I (2) = 1/2(2)^2 - 2
= 1/2.4 - 2
= 2 - 2
= 0
HP = { ( 3, 5/2 ), ( 4, 6 ), ( 5, 21/2 ) }