danielezunino wrote:

Hello,

can anybody help me understand this question?

Many thanks!!

Daniele

If 2^x- 2^(x-2) = 3(2^13) then x is equal to ?

a .9

b.11

c.13

d.15

e.17

Q:2^x- 2^(x-2) = 3(2^13)

==>2^x = 3(2^13)+2^(x-2)

So the value of X should be more than 13. Only 2 options which are greater than 13.

15 and 17

If we substitute 15.

2^15 = 3(2^13)+2^13

2^2 * 2^13 = 4(2^13)

4(2^13) = 4 (2^13) so 15 (D )

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