Question

mình đang gấp tl giùm nha mn y =2x² - 3 

tinh f(-1/2) (-2)

 

Answer 1

\(f\left(\frac{-1}{2}\right)\Leftrightarrow y=2.\left(\frac{-1}{2}\right)^2-3=\frac{1}{2}-3=\frac{-5}{2}\)

\(f\left(-2\right)\Leftrightarrow y=2.\left(-2\right)^2-3=8-3=5\)

Answer 2

Ta có: f(-1/2)=2.(-1/2)² -3=2.1/4-3=-5/2

          f(-2)=2.(-2)² -3=5

Vậy f(-1/2)=-5/2

       f(-2)=5