Question

aflati nr natural X care verifica 8×7la puterea X=7la puterea22+7la puterea23

Answer 1

$8\cdot7^x=7^{22}+7^{23} \Rightarrow 8\cdot7^x= 7^{22}(1+7) \Rightarrow 8\cdot7^x= 7^{22} \cdot 8 |_{: 8}$  

$\Rightarrow 7^x= 7^{22} \Rightarrow x= 22$