Question

Exercitiul 6 urgent
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Answer 1

[tex]a=3~~;~~b=8\\ a)~~(a+b)(a-b)\ \textless \ =\ \textgreater \ (3+8)(3-8)=\ \textgreater \ 11*(-5)=-55\\ Formula~folosita:a^2-b^2=(a+b)(a-b)\ \textless \ =\ \textgreater \ 3^2-8^2\\ =\ \textgreater \ 9-64=-55\\\\ b)(a+b)^2\ \textless \ =\ \textgreater \ (3+8)^2=\ \textgreater \ 11^2=121.\\ Formula~folosita:(a+b)^2=a^2+2ab+b^2\\ \ \textless \ =\ \textgreater \ (3+8)^2=3^2+2*3*8+8^2=\ \textgreater \ 9+48+64=121.\\\\ c)(a-b)^2\ \textless \ =\ \textgreater \ (3-8)^2=(-5)^2=25\\ Formula~folosita:(a-b)^2=a^2-2ab+b^2\\ \ \textless \ =\ \textgreater \ (3-8)^2=3^2-2*3*8+8^2=\ \textgreater \ 9-48+64=25[/tex]