64x³+343y³
= (4x)³ + (7y)³
= (4x+7y)[(4x)^2+(7y)^2-(4x)(7y)]
= (4x+7y)(16x^2+49y^2-28xy)
Answer: (4x+7y)(16x^2+49y^2-28xy)
9.5m questions
12.2m answers