Practice Quiz

GMAT Math Practice Test #1

Category - Math

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(1+√3)(1-√3)=
  1. -3
  2. -2
  3. 4
  4. 3-2√3
Explanation
Answer B: a2-b2=(a+b)X(a-b). So the given value is equal to 12-(Ѵ3)2=-2

Key takeaway: The square root of the numbers like √3 is a decimal number and expression would require long calculation if we put in the given. So look for a way to attack such problems other way than straight arithmetic calculation. You should be able to find application of simple algebraic formulae.
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