Question

Determinati valoarea minima a expresiei E=3x^2-8,unde x apartine R

Answer 1

$x^2 \geq 0 ~ \forall x~ \in R \Rightarrow E \geq 3 \cdot 0-8=-8. \\ \\ Asadar,~valoarea~minima~a~expresiei~este~-8~(si~se~realizeaza \\ \\ pentru~x=0).$