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=(64a² +40ab)(40ba+25b²)
=64a²80ab²+25b²
#Maaf ya kalau jawaban dan caranya salah.
= (8a)² + 2 x 8a x 5b + (5b)²
= 8²a² + 2 x 8a x 5b + 5²b²
= 64a² + 2 x 8a x 5b + 25b²
= 64a² + 80ab + 25b²
Semoga membantu ya ^_^
Maaf kalau salah.