Question

Can someone explain this to me? The lessons for this module are being vague.
http://i.imgur.com/6icbdVx.png

Answer 1

so what happens to the sign of successive terms?

Answer 2

Seems that it's changing every other term.

Answer 3

that's right - and what happens to a negative number when you raise it to even power and ot odd power (e.g. 1,2,3,4....)

Answer 4

Well, if you ask my calculator it'll always be negative. ¯\_(ツ)_/¯

Answer 5

I didn't ask your calculator
-3^1 = -3
-3^2= +9
-3^3= -27......

Answer 6

so in order to get alternating + and - numbers what can we tall about the number we raise?

Answer 7

Would that mean the 2 would become a negative?

Answer 8

yes - we must have a -2 in the brackets

NOW look at the first term - it's 9

if we have n=0 for the first term WHICH of the answers gives a value =9

Answer 9

Would it be the misclick answer, since 2^0 gives a -1?

Answer 10

if 2^0 was -1 then the answer would be -9

what is -2^0?

Answer 11

-2?

Answer 12

no

Answer 13

try your calculator if oyu do not already know

2^0 =?

Answer 14

try your calculator if oyu do not already know

-2^0 =?

Answer 15

It's still giving me -1.

Answer 16

I don't think so

are you using the x^y function

-2 x^y -1 =?

Answer 17

I'm just plugging in what was said: -2^0 and the calculator is spitting out -1.

Answer 18

OK I see what is wrong

Answer 19

User error?

Answer 20

(and my post above is wrong)

the calculator reads that as

0- (2 ^-1)

You need touse the (+/-) button to change 2 to -2

2 (+/-) x^y -1

Answer 21

The subtraction key? Because that's still giving me -1.

Answer 22

NO - it's not the subtraction key

It is marked +/- and it changes the sign of the 2 to -2 BEFORE you r do the exponent

(and my post above is wrong)

the calculator reads that as

0- (2 ^-1)

You need touse the (+/-) button to change 2 to -2

2 (+/-) x^y 0=

Answer 23

Yeah.. Seems that I don't have that key on my calculator.

Answer 24

Regardless, thanks for the help.

Answer 25

that is unlikely

it is an important function- but use the calculator in Windows if not

ANYHOW

maybe you remember x^0 = 1 for ANY vale of x

so -2^0 = 1

Answer 26

I can take a picture of said calculator if you'd like, but I see.

Answer 27

http://www.lowpriceofficesupplies.co.uk/Item/910334.html

even this simple one has it - next to the decimal

anyhow
back to the question

if -2^0 =1 then what is the first term of the last option (the misclick)?

Answer 28

-2^0 = 1
-2^1 = -2
-2^2 = 4
-2^3 = -8 ...

Correct?

Answer 29

And by the way, I'm using this one https://www.google.com/shopping/product/12766716122294359618?q=Casio+fx-300ES+plus&rlz=1C1CHWA_enUS611US611&oq=Casio+fx-300ES+plus&aqs=chrome..69i57.11045j0j7&sourceid=chrome&es_sm=93&ie=UTF-8&sa=X&ei=FIBbVcW5O8-1sQS1q4Eg&ved=0CHAQuiQ

Answer 30

yes correct and what happens if oyu multiply those numbers by 9 ?(compare with original series....)

Answer 31

Then it begins to equal the original set of numbers.

Answer 32

;-)

Answer 33

Thanks a million for the help.