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a. 3a(a^3 - 3)
b. 5xy(x + 3y)
c. 7b(b - 2a)
2.
a. (p-8)(p+8)
b. (4x+10y)(4x-10y)
c. a^2 + b^2 - 9
d. (4q-15)(4q+15)
3.
semuanya bisa pake rumus cepet, (a+b)(a-b)
contoh yang a. 55=a dan 53=b coba itung sendiri ya, biar sekalian belajar