Question

Efectuati, utilizand formula (a+b)(a-b)=a²- b²:
a) (x+3)(x-3);
b) (a-2)(a+2);
c) (b-4)(b+4);
d) (2x-3)(2x+3) ;
e) ( 2a+1)(2a-1);
f) (2a+3b)(2a-3b);
Ajutati-ma ,va rog frumos,ca nu e greu ,pentru cei care stiu ...sa le rezolve 

Answer 1

a) (x+3)(x-3)=x²-9
b) (a-2)(a+2)=a²-4
c) (b-4)(b+4)=b²-16
d) (2x-3)(2x+3) =4x²-9
e) ( 2a+1)(2a-1)=4a²-1
f) (2a+3b)(2a-3b)=4a²-9b²