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b. 5(a^2 - 2a +4 = 5a^2 - 10a + 20
c.-(a^2 + 4a - 7) = -a^2 - 4a + 7
d.3a(2a + 5ab - 2bc) =6a^2 + 15a^2b - 6abc
e.-2a^2b(ab + 3ab^2 - 5a^3b) = -2a^3b^2 - 6a^3b^3 + 10a^5b^2
b. 5(a^2 - 2a +4 = 5a^2 - 10a + 20
c.-(a^2 + 4a - 7) = -a^2 - 4a + 7
d.3a(2a + 5ab - 2bc) =6a^a + 15a^2b - 6abc
e.-2a^2b(ab + 3ab^2 - 5a^3b) = -2a^3b^2 - 6a^3b^3 + 10a^5b^3
itu sdah