AGummiBear55 3 years ago HELP!! n an 1 4 2 12 3 28 4 60 Which recursive equation represents the pattern? an = an – 1 + 2n an = an – 1 + 2(n + 1) an = an – 1 + 2n + 1 an = an – 1 + 2n + 1

1. Helper93

All you need to do is to plug in both a and an and see which one is equal.

2. AGummiBear55

yeah, but what is the equation?

3. mathstudent55

12 - 4 = 8 28 - 12 = 16 60 - 28 = 32 Why are the third and fourth choices equal?

4. Helper93

You find which one is the right one by trying every equation till you get both sides equal.

5. mathstudent55

Are some n's and (n-1)'s subscripts and exponents?

6. AGummiBear55

I'm still a lot confused on what the heck to do...

7. AGummiBear55

@mathstudent55 What do I subtract 60 by?

8. AGummiBear55

Grr.. Im so confused!! :/

9. mathstudent55

n an 1 4 2 12 4 + 8 4 + 2^3 3 28 12 + 16 12 + 2^4 4 60 28 + 32 28 + 2^5 Do you see a pattern? Each term, an, is obtained by adding the previous term to 2 to the power n + 1

10. mathstudent55

The way you wrote the choices makes no sense. There must be some exponents and subscripts there. You wrote everything as if it were simple numbers.

11. mathstudent55

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12. mathstudent55

None of the choices you gave represent the recursive rule. Also, the third and fourth choices in your post are the same.

13. AGummiBear55

14. AGummiBear55