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SAT Math Practice Exam

Category - Mathematics - Hard

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(1+√3)(1-√3)=

-3
-2
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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