1) 36а²-49= (6а-7)(6а+7)
2) -81+25у²= (-9+5у)(9+5у)
3) 47²-37²=(47-37)(47+37)
4) b²-4/9= (b-2/3)(b+2/3)
1) 36а²-49= (6а-7)(6а+7)
2) -81+25у²= (-9+5у)(9+5у)
3) 47²-37²=(47-37)(47+37)
4) b²-4/9= (b-2/3)(b+2/3)