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Sequences Videos 8 videos
SAT Math 1.5 Numbers and Operations. How many dots would be in the 5th term of this sequence?
SAT Math 2.1 Numbers and Operations. How many dots will be in the 6th term of this sequence?
SAT Math 8.1 Algebra and Functions 3277 Views
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Description:
SAT Math 8.1 Algebra and Functions
Transcript
- 00:02
A little birdy told us you wanted to solve a shmoopy problem...so, tweet tweet.
- 00:07
In a sequence, each number is five less than the square of the previous number.
- 00:12
If the first number is 2, what is the fourth number?
- 00:18
All right – we’re told that we’re dealing with a sequence…and we know the pattern:
- 00:23
each number is five less than the square of the previous number.
Full Transcript
- 00:26
So let’s start with the first number…
- 00:28
To find the second term, we have to square 2…which gives us 4, and then take 5 less
- 00:33
than that…4 minus 5 gives us NEGATIVE 1 as the second term.
- 00:38
Third term. Again, we square negative 1… which gives us 1.
- 00:42
Then we subtract 5 to give us NEGATIVE 4.
- 00:45
Fourth term…which is what we’re looking for. Negative 4 squared gives us 16.
- 00:50
Then subtract 5 is 11.
- 00:52
Fourth number is 11…and we’ve got our answer.
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