Question

REALLY dont understand graphing exponential function..can someone please tell me how to get the answer for #20

Answer 1

@satellite73 #20 was the problem i was confused for w/ the chart.....
i dont understand how to like subtract to get 7/8

Answer 2

I continued the calculations for one more step in both directions (I calculated for x = -2 and x = 6)

-2 -0.9375
-1 -0.875
0 -0.75
1 -0.5
2 0
3 1
4 3
5 7
6 15

and the graph is attached.

One thing you could really use is Open Office. It is downloadable here:
http://www.openoffice.org/download/
It is 100% free and well worth downloading.
See the series of numbers I posted and the graph? I did that all with Open Office.

Answer 3

thankss so much but what i am confused on is how to do 1/8 -1

Answer 4

As for calculating 2^(x-2) -1
Let's try it for x = -1

Answer 5

ok

Answer 6

For 2^(x-2) -1 when x=-1 we have
2^(-1-2) -1
which becomes
2^(-3) -1
2^-3 is 1/8
1/8 -1 = 7/8

Answer 7

-7/8 I mean

Answer 8

ok but how do you subtract 1/8-1 to get 7/8??

Answer 9

Okay you are subtracting
-1 from 1/8
-1 = -8/8
So you have -8/8 +1/8 = 7/8

Answer 10

-7/8 ARRGGHHHHH

Answer 11

ommgg thxx now i get it

Answer 12

Okay - glad I could help
:-)