Answer:
c. [tex] - 3 \sqrt{5} [/tex]
Step-by-step explanation:
[tex]3 \sqrt{5} - 2 \sqrt{45} [/tex]
[tex] - 2 \times 3 \sqrt{5} = - 6 \sqrt{5} [/tex]
[tex]3 \sqrt{5} - 6 \sqrt{5} [/tex]
[tex](3 - 6) \sqrt{5} = - 3 \sqrt{5} [/tex]
[tex] \boxed{\green{= - 3 \sqrt{5} }}[/tex]
