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Ganti x = 5 Ganti x = -4
f(5) = 5p + q f(-4) = -4p + q
7 = 5p + q - 11 = -4p + q -----> q = 4p - 11
Subsitusi :
7 = 5p + q
7 = 5p + (4p - 11)
7 = 5p + 4p - 11
18 = 9p
p = 2 ----------> q = 4(2) - 11 = - 3
Jawab :
a) p = 2 dan q = -3
b) f(x) = 2x - 3
c) f(-2) = 2(-2) - 3
f(-2) = -7