Answer: [tex]9\sqrt{15}[/tex]
Work Shown:
[tex]x = 3\sqrt{135}\\\\x = 3\sqrt{9*15}\\\\x = 3\sqrt{9}*\sqrt{15}\\\\x = 3*3*\sqrt{15}\\\\x = 9\sqrt{15}\\\\[/tex]
In the second step, I factored 135 into 9*15 so that I could pull out the perfect square 9. This is the largest perfect square factor of 135. In the next step, I used the rule [tex]\sqrt{A*B}=\sqrt{A}*\sqrt{B}\\\\[/tex]