please help me solve. Blank 1 I have the answer 9 and blank 2 I have the answer 5. Blank 2 is correct but not Blank 1

Amplifying,
[tex]3\text{ }\sqrt[]{45}\rightarrow\sqrt[]{(3^2)\cdot45}\rightarrow\sqrt[]{9\cdot45}\rightarrow\sqrt[]{405}[/tex]Now, let's simplify:
[tex]undefined[/tex]Blank 1:
405
Blank 2:
[tex]undefined[/tex]