1)
(2y-5)²+40y-(2y+5)²=
=4y²-20y+25+40y-(4y²+20y+25)=
=4y²+20y+25-4y²-20y-25=0
2)
(7y+1)²-(y+7)²-48(y-1)(y+1)=
=49y²+14y+1-(y²+14y+49)-48(y²-1)=
=49y²+14y+1-y²-14y-49-48y²+48=0
Copyright © 2025 SCHOLAR.TIPS - All rights reserved.
Answers & Comments
Verified answer
1)
(2y-5)²+40y-(2y+5)²=
=4y²-20y+25+40y-(4y²+20y+25)=
=4y²+20y+25-4y²-20y-25=0
2)
(7y+1)²-(y+7)²-48(y-1)(y+1)=
=49y²+14y+1-(y²+14y+49)-48(y²-1)=
=49y²+14y+1-y²-14y-49-48y²+48=0