Question

Stiind ca a supra b = 4, unde a si b sunt numere reale nenule, aratati ca 3a- 2b supra b = 10.

Answer 1

a/b=4 <=> a/4=b/1=k
=> a=4k
b=k

3a-2b/b=10

(3*4k-2*k)/k= (12k-2k)/k= 10k/k=10