Q. 19

# If 4x – 4x-1 = 24, then (2x)x equalsA. 5B. C. 25D. 125

4x – 4x – 1 = 24

Let 4x = y

y - = 24

4y – y = 96

y = 32

4x = 32

22x = 25

(2x)x = (2 × )5/2

= (5)5/2 = 25

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