$$8\sqrt{6}+9\sqrt{6}$$  

(a)  

$$3\sqrt{5}+2\sqrt{2}$$  

(a)  

$$5\sqrt{25}+3\sqrt{16}$$  

(a)  

$$3\sqrt{5}\cdot2\sqrt{3}$$  

(a)  

$$4\sqrt{2}\cdot\sqrt{5}$$  

(a)  

$$3\sqrt{6}\cdot4\sqrt{6}$$  

(a)  

$$2\sqrt{8}\cdot3\sqrt{2}$$  

(a)  

$$\left(2\sqrt{3}\right)^2$$  

(a)  

$$-3\left(\sqrt{5}\right)^2$$  

(a)  

$$\left(-2\sqrt{5}\right)^2$$  

(a)  

$$\left(-\sqrt{3}\right)^2$$  

(a)