已知函数$f\left(x\right)=\left\{\begin{array}{c}-x^2,x\ge 0\\ x^2+2x,x<0\end{array}\right.$，则f（2）=____ ；不等式f（x）＜3的解____

C

    Hi! I'm Alan. This is my dream house (梦幻屋). It has a small but nice room. Some pictures are on the wall. There is (有)a bookcase in my room. There is a desk and a chair in it. My schoolbag is on the desk. Oh! Where is my pencil case? It is under the chair. There are some pencils and a ruler in the pencil case. My shoes and a basketball are under the bed. I like my dream house very much.