Grade 10 math, radicals (?)

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

THANKSS

Find value of X with radicals

a) √2 (x - √3) + 5 √6 = - √6 / 2

b) x+√5 (minus) X- √15 = 0 * both of the terms have a 2 as denominator

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2 . 2

c) (x + 2√10) (x - √90) = (cubed root)3√36

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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

Find value of X with radicals

Double post, wasnt a bump im in argentina and these things get messy