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(2a+b)^2-(a-b)^2

Bruk kvadratsetningene.

[tex](2a+b)^{2}-(a-b)^2[/tex]

[tex](4a^2+4ab+b^2)-(a^2-2ab+b^2)[/tex]

[tex]4a^2-a^2+4ab+2ab+b^2-b^2[/tex]

[tex]3a^2+6ab[/tex]

mari___ wrote:(2a+b)^2-(a-b)^2

Tror det vil bli noe sånn

=4a^2 +4ab+b^2-a^2 -2ab+b^2
=3a^2 +2ab+2b^2