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dusya [7]
4 years ago
13

-1, 2, 7, 14, 23 can someone help me find quadratic nth term and explain please?

Mathematics
1 answer:
goblinko [34]4 years ago
8 0

Answer:

a_{n} = n² - 2

Step-by-step explanation:

Consider the differences between the values

- 1  ,  2  ,  7  ,  14  ,  23

    3      5     7     9 ← not constant

Now consider the difference of these differences

3  ,  5  ,  7  ,  9

   2     2     2 ← constant

Since the second differences are constant, this indicates a quadratic n²

Now consider the position values of n

n = 1 : 1² = 1 ← require to subtract 2 for - 1

n = 2 : 2² = 4 ← require to subtract 2 for 2

n = 3 : 3² = 9 ← require to subtract 2 for 7

n = 4 : 4² = 16 ← require to subtract 2 for 14

n = 5 : 5² = 25 ← require to subtract 2 for 23

Thus n th term formula is

a_{n} = n² - 2

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Part A. You have the correct first and second derivative.

---------------------------------------------------------------------

Part B. You'll need to be more specific. What I would do is show how the quantity (-2x+1)^4 is always nonnegative. This is because x^4 = (x^2)^2 is always nonnegative. So (-2x+1)^4 >= 0. The coefficient -10a is either positive or negative depending on the value of 'a'. If a > 0, then -10a is negative. Making h ' (x) negative. So in this case, h(x) is monotonically decreasing always. On the flip side, if a < 0, then h ' (x) is monotonically increasing as h ' (x) is positive.

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Part C. What this is saying is basically "if we change 'a' and/or 'b', then the extrema will NOT change". So is that the case? Let's find out

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so either
-10a = 0 or (-2x+1)^4 = 0
The first part is all we care about. Solving for 'a' gets us a = 0. 
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