Algebra ii. radical expressions.: multiply, and then simplify if possible. show your work.

Remember distributive property
a(b+c)=ab+ac
a(b-c)=ab-ac

also
law of exponents
=

and
(a-b)(a+b)=a^2-b^2 (for question 14)
and (a+b)^2=a^2+2ab+b^2 (for question 15)

11.  ==

12. 108+(28∛21)

13. (-2√6)+(4√10)

14.√(2x-3)-49

15. 2x+(20√x)+50

16. (3∛2)-(6∛4)-16

17. 42x-6