There was one example in my school work today that didn't make sense.
You need to figure out the formula for the following pattern
-1, 5, -9, 13, -7
The provided solution is:
Odd numbers: -1^n
Even numbers: 4n -3
They don't show how they got there at all.
As you could probably see the odd number solution does not work.
But I can't figure out the actual formula.
Could someone please help me with this?
The formula is a combination of both ie (-1)n (4n-3) where n = 1,2,3,....
you see the (-1)n is just the mathematical way of putting a minus sign in front of a number.
odd powers give a minus and even powers give a plus eg (-1)3 = -1 , (-1)6 = 1
and of course the 4n-3 gives you 1,5,9,......