(a2+3a-3)(a2+3a+1)-5
=( a²+3a)-2(a²+3a)-8
=(a²+3a-4)(a²+3a+2)
=(a+4)(a-1)(a+1)(a+2)
(1-a2)(1-b2)+4ab
=1-a²-b²+a²b²+4ab
=(a²b²+2ab+1)-(a²-2ab+b²)
=(ab+1)²-(a-b)²
=(ab+1+a-b)(ab+1-a+b)
(a2+3a-3)(a2+3a+1)-5
=( a²+3a)-2(a²+3a)-8
=(a²+3a-4)(a²+3a+2)
=(a+4)(a-1)(a+1)(a+2)
(1-a2)(1-b2)+4ab
=1-a²-b²+a²b²+4ab
=(a²b²+2ab+1)-(a²-2ab+b²)
=(ab+1)²-(a-b)²
=(ab+1+a-b)(ab+1-a+b)