2) 3(a³-b³)+5(a²-b²)= 3(a-b)(a²+ab+b²)+5(a-b)(a+b)= (a-b)(3a²+3ab+3b²+5a+5b)
3) (a³-b³)+(a²-b²)= (a-b)(a²+ab+b²)+(a-b)(a+b)= (a-b)(a²+ab+b²+a+b)
4) a³(a-b)+b³(a-b)= (a³+b³)(a-b)= (a+b)(a²-ab+b²)(a-b)
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2) 3(a³-b³)+5(a²-b²)= 3(a-b)(a²+ab+b²)+5(a-b)(a+b)= (a-b)(3a²+3ab+3b²+5a+5b)
3) (a³-b³)+(a²-b²)= (a-b)(a²+ab+b²)+(a-b)(a+b)= (a-b)(a²+ab+b²+a+b)
4) a³(a-b)+b³(a-b)= (a³+b³)(a-b)= (a+b)(a²-ab+b²)(a-b)