Surds and Indices

Q1: If 5a = 3125, then the value of 5(a - 3) is:

A 125

B 25

C 1625

D 625

ANS:A - 25

5a = 3125        5a = 55  a = 5.  5(a - 3) = 5(5 - 3) = 52 = 25.



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