Tommy your answer for a) is correct.
For the other questions
You are correct in saying you need to use a perfect square binomial expansion.
Hello ive worked these out in my notebook but havbe no way to check if they are correct or not here they are
a) ( √2 - √8)² = 2
b) ( -1/3√3 - 1 )²
c) ( √3 + √12 ) ²
I know I got to do the perfect square trinomial
a²+ 2ab + b² I did that just would like the working out of it and answers in case I got them wrong
ps , im not skipping on my homewrok just got a test on thurdays and want to see if im ok since i go t no more math classes till then thats why I ask for the work out of it
a) √2 (x - √3) + 5 √6 = - √6 / 2
b) x+√5 (minus) X- √15 = 0 * both of the terms have a 2 as denominator
2 . 2
c) (x + 2√10) (x - √90) = (cubed root)3√36
This is a new unit lets say and i want to see if I can get ahead a little, having the thing worked out in full would be awsome so I have some background as to what our first class after the test will be taught