Question

determinati nr nat x stiind ca 7la puterea x + 7 la puterea x+2 =2450

Answer 1

7^x+7^(x+2)=2450 7^x*(1+7^2)=2450 7^x*50=2450 7^x=2450:50 7^x=49 7^x=7^2 x=2