Question

math problem

Answer 1

we've done like 5 of these already! give it a shot to solve it urself, and i will explain it to u in just a bit. busy momentally.

Answer 2

ah -- i will solve this, and then go

so, the form we want ti to be is
\[ y=a(b)^x \]
lets solve for a first -- the coordinates of the 1st point are:
\[ (y,exponential \ \ x) \Rightarrow (1,-20) \]

plugging that info in the formula, we get:
\[ -20=a(b)^1 \]
\[ a=?? \]

Answer 3

-20/b

Answer 4

@kittybasil

Answer 5

dude f(x) is the same thing as trying to find y........subtract 80-20 to get the y.........u make stuff hard and confusing.....and stop with the usless comments

Answer 6

-20/b

Answer 7

a=-20/b?

Answer 8

guys

Answer 9

b= ??

Answer 10

4

Answer 11

positive 4, or negative 4?

Answer 12

positive 4

Answer 13

awesome!

so we have
\[ b=4 \]

lets find a
\[ a= -\frac{20}{b} \]
\[ a= -\frac{20}{4} \]
\[ a= ? \]

Answer 14

-5

Answer 15

correct! so we have
\[ a=-5 \]
\[ b=4 \]
plug that in this formula
\[ y=a(b)^x \]

Answer 16

-20^x

Answer 17

nono, do not do anything with it -- leave it in \( y=a(b)^x \) form

Answer 18

y=-5(4)^x

Answer 19

There you go!

remember from your previous posts, that we got it wrong, just because the way you inserted it was not as your teacher set it up?

to make sure we get it correctly, it should be:

\[ \Large f(x)=-5 \cdot 4^{x} \]
so basically just take the brackets off haha.

Answer 20

thanks

Answer 21

you got it!