Question

am nevoie la 6 si 9 va rog, urgent

Answer 1

$\it 6.\\ \\ a^2+2ab+b^2=(a+b)^2\\ \\ 98^2+2\cdot98\cdot2+2^2=(98+2)^2=100^2=100\cdot100=10000\\ \\ \\ a^2-b^2=(a-b)(a+b)\\ \\ 104^2-96^2=(104-96)(104+96)=8\cdot200=1600$

$\it 9.\\ \\ 99^2-1^2=(99-1)(99+1)=98\cdot100=9800\\ \\ a^2-2ab+b^2=(a-b)^2\\ \\ 74^2-2\cdot74\cdot49^2=(74-49)^2=25^2=25\cdot25=625$