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9x^+15x-21x-35
9x^-6x-35
2. (5p-6)^
(5p-6)(5p-6)
25p^-30p-30p+36
25p^-60p+36
3. (6p-2q)^
(6p-2q)(6p-2q)
36p^-12pq-12pq+4q
36p^-24pq+4q
ket: ^=pangkat dua