Question

Afla valoarea lui n stiind că:[(n+2)(n+3)+25]:9+11=20

Answer 1

[(n+2)•(n+3)+25]:9+11=20. [(n+2)•(n+3)+25]:9=20-11=9. (n+2)•(n+3)+25=9•9=81. (n+2)•(n+3)=81-25=56. n•2+3+2=56. n•2=56-3-2=51. n=51:2. n=25,5