book Maths Puzzle Numerical Ability

help me figure out this:
(i squareroot-363)(squareroot-243)

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book Other Question

if n people attened a social gathering and each person shakes hands with each of the other peopleexactly once, then the number of handshakesthat will take place is give by the formula n(n-1)= 36 handskes occured?
/2 show me steps to solve this 8b-4=5b+8