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p^2 -2qr+3p = (-1)^2 - 2 x 2 x (-3) +3 x (-1)
=1 - ( -12) + (-3)
= 1 + 12 - 3
= 10
maaf kalo salah
= (-1)² - 2(2.-3) + 3(-1)
= 1 - (-12) + -3
= 10
b. p² - 2qr + 3p
= (1)² - 2(5.-2) + 3(1)
= 1 - (-20) + 3
= 24
c. p² - 2qr + 3p
= (3)² - 2(2.-5) + 3(3)
= 9 - (-20) + 9
= 38
semoga membantu :)