Q15 of 34 Page 252

If find the value of (x2 + y2)

Or


Simplify:

(on rationalizing we get)


= 4 + (√5)(√3)


= 4 + √15


Similarly (rationalising)



= (5 + 3-2(√5)(√3))/2


= 4- (√5) (√3)


= 4- √15


So,



= 32 + 30


= 62


(II)


Taking LCM as (3 + √5)( 3-√5)



(since (a + b)(a - b) = a2 - b2)



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