Answers

2015-09-01T13:39:44+05:30
Here a=-2 & b=root3 so by using a2-b2=(a+b)(a-b) we have, (-2)whole sq. - (root3)whole sq. 4-3=1
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2015-09-01T14:47:34+05:30
(-2-√3)(-2+√3)
basically this is 
(a+b)(a-b)
=a²-b²
⇒-2²-√3²
⇒4-3
⇒1

Ans=1
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