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kalau ya semoga benar
1. 2x2-6xy-20y2 (karna gak bisa soal pemfaktoran kayak gini)
2. 3a2-13a-10
= (3a+2)(a-5)
=(2x-10y)(x+2y)
b. 3a^2-13a-10
=(3a-10)(a-1)
mdh2an benar..