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b.25p²-36=(5²p²-6²)=(5p+6)(5p-6)
c.100-9a²=(10²-3²a²)=(10-3a)(10+3a)
d.64x²-49y²=(8²x²-7²y²)=(8x-7y)(8x+7y)
Maaf kalau salah!!!