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f(2) = 10
10 = 7(2) + p
10 = 14 + p
10-14 = p
p = - 4
tuk f(3) = 7(3) + p
= 21 + p
= 21 + (- 4)
= 17
tuk f(-2) = 7(-2) + p
= -14 + p
= -14 + (-4)
= -18
maka f(3) + f(-2) = 17 + (-18) = 17 - 18 = -1