i) (3 – √7)(5 + 2 √7)how do u do this sum

roro123
multiply it out, so 3 by 5 is 15 and 3 by 2√7 is 6√7, and √7 by 5 is 5√7, and √7 by 2√7 is 2 by 7 which is 14.
now you have 15+6√75√714
which is 1+√7
hope this helped

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