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f(3) = 3p + q = -1
——————— ----
-5p = 15
p = -3
• 3p + q = -1
3(-3) + q = -1
q = -1 + 9
q = 8
..
f(5) = 5p + q
= 5(-3) + 8
= -15 + 8
= -7 (B)