Multiply:
i). 3√5+2√3 by 4√5-5√3
ii). √2+√5+√7 by √2+√5-√7
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I only know one question that is in attachment, but glad that I couldn't answer 2
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1st multiply root2 with the whole 2nd eq. then root5 and then root7 then cancel and u will get 2root10
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