Verified answer

Boy, that sounds more like a command than a question! Go here to learn how to expand two terms:

http://www.purplemath.com/modules/polymult.htm

Then remember that √m * √n = √(mn), and that √m * √m = m

In general ( a - b )*( c + d ) = ac +ad - bc - bd

So, (15 x 6) + ( 30 x sqrt 30 ) - ( 30 x sqrt 30 ) - ( 60 x 5 )

middle two parts cancel to leave 90 - 300 = - 210

N.B. Remember rules like sqrt A times sqrt B is sqrt ( A times B )

i.e. sqrt5 times sqrt 6 is sqrt 30

and sqrt5 times sqrt5 is 5, so sqrt 6 times sqrt 6 is 6