kvadratsetningene?
Posted: 22/03-2010 21:28
(2a+5b)^2=
(2x)- 5/4)^2=
(3-x)(3+x)=
(2x)- 5/4)^2=
(3-x)(3+x)=
[tex](a+b)^2 \, = \, a^2 \, + \, 2ab \, + b^2 [/tex]
[tex](a-b)^2 \, = \, a^2 \, - \, 2ab \, + \, a^2 [/tex]
[tex](a-b)(a+b) \, = \, a^2 \, - \, b^2 [/tex]