Can someone please help me to solve this problem?

[![enter image description here](https://i.stack.imgur.com/Z3PNH.jpg)](https://i.stack.imgur.com/Z3PNH.jpg)

I tried to solve it:

[![enter image description here](https://i.stack.imgur.com/pmvR6.jpg)](https://i.stack.imgur.com/pmvR6.jpg)