Question

I do not know how to work this out... can someone PLEASE help me???

Answer 1

= square root 11 (5 - 12 - 2)
= square root 11(-9)
= -9 square root 11

answer is C.
you got it right

Answer 2

5 of something - 12 of the same thing  - 2 of the same thing
= 5 of x - 12 of x - 2 of x
=5x-12x-2x
=x(5-12-2)
=-9x

$5 \sqrt{11} -12 \sqrt{11} -2 \sqrt{11} \\~\\=( \sqrt{11} )(5-12-2)\\~\\-9 \sqrt{11}$

I hope you got the idea!