Question

Daca a la puterea 2 - b la puterea 2= 24 si 3a+3b=6,atunci a-b=?

Answer 1

^ - acest semn inseamna la puterea

a^2-b^2=24
(a-b)(a+b)=24
3(a+b)=6
a+b=2

(a-b)•2 =24
(a-b)=12

Answer 2

a^2-b^2=(a-b)(a+b)=24

3a+3b=3(a+b)=6 ⇒  a+b=2

cu (a+2)=2 inlocuim in prima relatie
(a-b) x 2 = 24
a-b=12