if ( 2 to the x ) - ( 2 to the ( x - 2 ) ) = 3 ( 2 to the 9 ), what is the value of x?  Choose the correct answer
A) 9 B) 11 C) 13 D) 15 E) 17
<gadget id="calculator">9 + 2</gadget>
<output>11</output>

<result>B</result>
if ( 2 to the x ) - ( 2 to the ( x - 2 ) ) = 3 ( 2 to the 9 ), what is the value of x?
add(9, 2)
"( 2 to the power x ) - ( 2 to the power ( x - 2 ) ) = 3 ( 2 to the power 9 ) 2 ^ x - 2 ^ ( x - 2 ) = 3 . 2 ^ 9 hence x = 11 . answer is b"