[tex] \huge\quad\qquad\underline{{\sf Answer}}[/tex]
Let's solve ~
[tex]\qquad \sf \dashrightarrow \: - 4 \sqrt{135} + 7 \sqrt{15} [/tex]
[tex]\qquad \tt \dashrightarrow \: - 4 \sqrt{5 \times3 \times 3 \times 3} + 7 \sqrt{15} [/tex]
[tex]\qquad \tt \dashrightarrow \:( - 4 \times 3) \sqrt{5 \times 3} + 7 \sqrt{15} [/tex]
[tex]\qquad \tt \dashrightarrow \: - 12 \sqrt{15 } + 7 \sqrt{15} [/tex]
[tex]\qquad \tt \dashrightarrow \: - 5 \sqrt{15} [/tex]
