# Help on Exponents

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I'm writing my maths exam soon and i was doing a problem involving the simplification of exponents. I follow the steps for simplifying perfectly but i come out with te wrong answer according to my text book. Heres the problem: 2x3 to the power of n minus 3 to the power of (n+2) divided by 3 to the power of (n+1). My answer is -6/3 but my text books is -7/3. Which ones right?

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Is that

(2*3)^n - ( 3^(n+2) / 3^(n+1) )

or

( (2*3)^n - 3^(n+2) ) / 3^(n+1)

or

something else

?

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(2*3^n - 3^n+2)/(3^n+1)

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Quite easy, you should have remade the calcul :

(2*3^n - 3^n+2)/(3^n+1)
= (2 - 3^2) / 3
= (2 - 9) / 3
= -7 / 3

Seb

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thanks i figured out where i was going wrong

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