Question

Koi btaega mereko ki isme kya glt h
correct Answer is 1​

Answer 1

Answer:

It's in the second last step, I don't know about the calculations but the method is clearly wrong there.

Step-by-step explanation:

See you cannot just cancel numbers like that, because one is 3√30 and other is 6√30.

Both are different. Second one is twice as first one (because 3x2 = 6).

You could've done something like:

$3 \sqrt{30} - 6 \sqrt{30} \\ taking \: \sqrt{30} \: common \: and \: factoring \: it \: out \\ \\ = \sqrt{30} (3 - 6) = - 2 \sqrt{30}$