Question

f(x)=3x-5 Determinati numerele reale a, care verifica relatia f(a)+f(a+1)=10

Answer 1

f(a)=3a-5
f(a+1)=3(a+1)-5
3a-5+3a+3-5=10
6a-10+3=10
6a-7=10
6a=10+7
6a=17⇒a=17/6