Question

Fie f:R➡R , f(x)=x+2 si g:R➡R , g(x)=8-x
a) calculati S=f(2)+g(2)
b) rezolvati in R ecuatia f(x)=g(x)
c) rezolvati in R inecuatia f(x)

Answer 1

a) f(2)=2+2=4 iar g(2)=8-2=6 ⇒ f(2)+g(2)=4+6=10
b) f(x)=g(x) ⇔ x+2=8-x ⇒ 2x=6 ⇒ x=3