exam Maths Puzzle Numerical Ability

Please help...

sqrt63 - 2sqrt28 + 5sqrt7

These are so confusing for me.

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exam Other Question

this is a multiplacation problem ,can you teel me if this is correct ,if not can you show me the right way
(3m-2n)
(3m)*(-2n^2 )
3*m*2*n^2
-6*m*n^2 Can you please help me this exponental problem: x^2=6x-8? Thank you!