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=> f(-2)= -13
= -2p+q=-13
f(x)= (x-3) sisa 7
=> f(3)= 7
= 3p+q=7
substitusikan
-2p + q = -13
3p + q = 7
----------------+
-5p = -20
p =4
* 3p +q = 7
q = -5
==> S(x) = px + q
= 4x -5
good luck!!