How do I do the trinomial when I present mode I get this

@Nagy Elraheb radius 8 why isn’t it 4??

If transfer the 14 to the other side what will i do with -n it’s going to be -n = 2 what should I do ??

The question above how do I do solve both of them..

@Nagy Elraheb okay thank you I tried it and i understood

Is this right??

thanks

I still don’t understand :(

??