2.1) 16х²-24ху 8х(2х-3у)2)9а^5-18а^79а^5(1-2а²)3)9m-9n+my-ny 9(m-n)+y(m-n)(m-n)(9+y)3.1) 2x²+18x=02x(x+9)=0|÷2x(x+9)=0x=0x+9=0x1=0x2=-94.5y(2y-3)-(y+4)(y-3)10y²-15y-(y²-3y+4y-12)10y²-15y -y²-y+12 9y²-16y+125.(6x+1)(3x+2)=(9x-1)(2x+5)-3x18x²+12x+3x+2=18x²+45x-2x-5-3x 18x²+15x+2=18x²+40x-518x²+15x+2-18x²-40x+5=0-25x+7=0-25x=-7|÷(-25)x=7/257.x²+11x+28x²+4x+7x+28x(x+7)+4(x+7)(x+7)(x+4)