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= 4(-3) + 5(4) - 2(1)
= -12+20-2
=8-2
=6 <----- jawaban
b. p² - 3pq - 4r
= -3² - 3(-3)(4) - 4(1)
= -27 - (-36) - 4
= -27+36-4
= 9-4
= 5 <------ jawaban