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SAT Math Practice Exam

Category - Mathematics - Hard

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( √5 + √5 )2 =

Explanation

Answer C Use simple algebra rules ( √5 + √5 )² = (√5)² (1 + 1)² = 5 x 4 =20

Key takeaway: The square root of the numbers like √5 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 some factors or application of simple algebraic formulae.

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