SSC CGL Model Paper 13

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Question : 71 of 100

Marks: +1, -0

If

2^{x+4}-2^{x+2}=3

, then

x

is equal to

0
2
-1
-2

Solution:

2^{x+4}-2^{x+2}=3

2^x . 2^4-2^x . 2^2 =3

2^x[16-4]=3

2^x ×12=3

2^x=2^{-2}

x=-2

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