Q9 of 29 Page 5

Express the following expression in the form of a + ib:

( 3+i root 5 ) ( 3-i root 5 )/( root 3 + root 21 ) - ( root 3-i root 2 )


Use formula: (a + b)(a - b) = a2 - b2 in the numerator we get,






Rationalizing it,







Or,



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