1)(a-1)(a-17)
2)-(x-3)(x+7)
3)4(15y^2-5y-2)
4)-0,125(x-4)(x+10)
5)0,25(2y+1)(y-1)
6)5(3x-5)^2
1. a²-18a+17=(a-1)(a-17)
2. -x²-4x+21 =(x-7)(x+3)
3. 60y²-20y-5=(10у-5)(6у+1)=5(2y-1)(6y+1)
4. -1/8x²-3/4x+5=− 1/8(x+3)²+6,125
5. 1/2y²-1/4y-1/4=(0,5y-0,5)(y+0,5)=0 ,5(y-1)(y+0,5)
6. 45x²-150x+125=45(x−1 2/3)(x−1 2/3)
