Răspunsuri

2014-05-11T10:52:17+03:00
(x+4)^2=
x^2+2*x*4+4^2=
x^2+8x+16

Formula e (a+b)^2=a^2+2ab+b^2

[12-3][12+3]=
12^2-3^2=
144-9=
135

Formula e (a+b)(a-b)=a^2-b^2
1 5 1
2014-05-11T10:52:21+03:00
(x+4) la 2+
xla2+2*x*4+4 la2=xla2+8x+16

(12-3)(12+3)=
12  la2 -3 la2=144-6
                   =138