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Square Root and Cube Root

Q1:

If a = 0.1039, then the value of 4a2 - 4a + 1 + 3a is:

A 0.1039

B 0.2078

C 1.1039

D 2.1039

ANS:C - 1.1039

4a2 - 4a + 1 + 3a = (1)2 + (2a)2 - 2 x 1 x 2a + 3a    = (1 - 2a)2 + 3a    = (1 - 2a) + 3a    = (1 + a)    = (1 + 0.1039)    = 1.1039



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