Question

Efectuati utilizind formula calculului prescurtat:
a) (2-3a)(2+3a)
b) (4m+n)la patrat

Answer 1

a).   (2-3a)(2+3a)=(2)^2-(3a)^2=4-9a^2 ;
b).   (4m+n)^2 = 16m^2+8mn+n^2 ;

Answer 2

a) (2-3a)(2+3a)=4-9a^2
b) (4m+n)^2=4m^2+2*4m*n+n^2= 16m^2+8mn+n^2