4) 2ab+10b-2a-10=2(ab+5b-a-5)=2(b×(a+5)-(a+5))=2(a+5)(b-1)
5) a⁴-16=(a²-4)(a²+4)=(a-2)(a+2)(a²+4)
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4) 2ab+10b-2a-10=2(ab+5b-a-5)=2(b×(a+5)-(a+5))=2(a+5)(b-1)
5) a⁴-16=(a²-4)(a²+4)=(a-2)(a+2)(a²+4)