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5 x (-2a) = -10a
5 x 4 = 20
jadi 5^2-10a+20
b. -2 a^2b x ab = -2a^3b^2
-2 a^2b x 3 ab^2 = -6 a^3b^3
-2 a^2b x -5a^3b = 10 a^5b^2
jadi -2a^3b^2 - 6 a^3b^3 + 10 a^5b^2
^ = dibaca pangkat ya..
sorry ol lewat hp.