What is the value of f if f + I-3 11/12 = 18

1 answer:

7 0

Solve for f:(i - 47/12) + f = 18
(i - 47/12) + f = f + (-47/12 + i):
f + (-47/12 + i) = 18
Subtract -47/12 + i from both sides:
Answer: f = 263/12 - i

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3 years ago

I need to know the next term in the sequence AND the nth term of all the sequences

ANEK [815]

I see you already did the ones where you figured out the formula. There's a fun way that doesn't require figuring out the formula, called a forward difference table.

Let's work out the first one to learn the technique. We write the sequence and under it the forward differences,

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We got 3=5-2, 5=10-5, 7=17-10, etc and the same for subsequent lines. Eventually we get to an all constant line and we stop.

To extend the table we just add some constants to the constant line and work our way back up:

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Let's do the ones you haven't.

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Three's our limit so I'll leave the last one to you.

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A comment says we need the functions. They're all quadratics. I'll tell you how they want you to do it and how to do it in general.

They just want you to recognize these are all pretty close to just $u_n=n^2$ . The one that goes 3 12 27 etc. we recognize as just $u_n=3n^2$ . The one that goes 2 8 18 is just $u_n =2n^2$ . The one that goes 3 9 19 is one more than that so $u_n=2n^2+1$ . The one that goes 2 11 26... is one less than 3 12 27 so is $u_n=3n^2-1$ . Again I'll leave the last one.