Question

Determinati nr real a pt care f(a)+f(a+1)=35 , unde f(x)=x-5 . Va rog frumos

Answer 1

Explicație pas cu pas:

f(a)=a-5

f(a+1)=a+1-5=a-4

f(a)+f(a+1)=35⇒a-5+a-4=35⇒2a-9=35⇒a=(35+9)/2⇒44/2=22

Bafta!