How u get the below part answer?
I don’t get it

Ok I'll guide you...I know it seems confusing..Nonetheless,you have learnt an essential skill of simplification when you see long and complex fractions/expressions like this..So,you can do it..What makes it uneasy is the surd..I show you how I do the qn..

How u get the second roll of the second qns... surd 450?

Multiplying square root 3 and Square root 150 is the same as multiplying 3 and 150 to get 450...You can only do this with surds(multiplying or dividing)..This is the reason why I seperate the surd 384 to 64 and 6 respectively at the bottom...

I take square root 64 here as I can divide it by 64 on the numerator..Well,you can see that after the seperation,both of the fractions have a common denominator of 5 times square root 2..To combine the fractions,I make the denominator the same..if I multiply 30(5times square root 2) to one side,I do it for the other side as well...if you don't prefer this method,rationalise the fractions with surds each and then combine them and continue the rest to find k...Do you need me to show you the rationalisation part (another method)?

This step I not sure. Can show me other steps.
Thabks

You mean the rationalisation step?..That is another step I told you earlier..I don't think there are other steps beside these two..

This step is way more easier than the other one...

*whole numbers*

So,the value is not 1905 but 960..

Did this method helps you?