Cho hàm số $y = - {x^2}$

A

- Hướng dẫn giải

 $\begin{array}{l}y = - {x^2}\\ \Rightarrow y\left( 2 \right) = - {2^2} = - 4 \Rightarrow \,\left( {2; - 4} \right)\\y\left( { - 2} \right) = - {\left( { - 2} \right)^2} = - 4 \Rightarrow \,\left( { - 2; - 4} \right)\\y\left( {\sqrt 3 } \right) = - {\left( {\sqrt 3 } \right)^2} = - 3 \\\Rightarrow \,\left( {\sqrt 3 ; - 3} \right)\\y\left( { - \sqrt 3 } \right) = - {\left( { - \sqrt 3 } \right)^2} = - 3\\ \Rightarrow \,\left( { - \sqrt 3 ; - 3} \right)\end{array}$