Question

Va roggg ajtor...!

Fie functia f:R→R, f(x) =5-2x.Determinati valoarile reale ale lui x,pentru care f(x) ≥f(1)-2.

Answer 1

f(x)=5-2x
f(1)=5-21⇒f(1)=3⇒fx)≥f(1)-2⇒5-2x≥3-2⇒5-2x≥1⇒-2x≥-5+1⇒-2x≥-4⇒x≥-4/-2⇒x≥2
sucees