Question

Giúp em vs.

Answer 1

a) \(f\left(\dfrac{1}{2}\right)=2\cdot\left(\dfrac{1}{2}\right)^2-3=2\cdot\dfrac{1}{4}-3=\dfrac{1}{2}-3=\dfrac{-5}{2}\)

\(f\left(-\dfrac{1}{2}\right)=2\cdot\left(\dfrac{-1}{2}\right)^2-3=2\cdot\dfrac{1}{4}-3=\dfrac{-5}{2}\)

\(f\left(1\right)=2\cdot1^2-3=2-3=-1\)

b) Thay y=-3 vào \(y=2x^2-3\), ta được:

\(2x^2-3=-3\)

\(\Leftrightarrow x=0\)