1) (4-5y)(5y+4)=20у+16-25у^2-20у=16-25у^2
2) (x-8)^2=x^2-16х+64
1. (4-5у)(5у-4)=(4-5у)(4+5у)=16+20у-20у-25у^2=16-25у^2.
2. (х-8)^2=х^2-16х+64.
1) (4-5y)(5y+4)=20у+16-25у^2-20у=16-25у^2
2) (x-8)^2=x^2-16х+64
1. (4-5у)(5у-4)=(4-5у)(4+5у)=16+20у-20у-25у^2=16-25у^2.
2. (х-8)^2=х^2-16х+64.