*I don't want the flat out answer i want help *

Which of the following exponential functions goes through the points (1, 12) and (2, 36)?

f(x) = 4(3)−x
f(x) = 3(4)−x
f(x) = 3(4)x
f(x) = 4(3)x

Question

*I don't want the flat out answer i want help *

Which of the following exponential functions goes through the points (1, 12) and (2, 36)?

 f(x) = 4(3)−x
 f(x) = 3(4)−x
 f(x) = 3(4)x
 f(x) = 4(3)x

amistre64 · Answer

trial and error are a mathmatikers best tools

amistre64 · Answer

also, your notation as it posted is not useful.

a^x indicates an exponent of x

anonymous · Answer

Oh yeah , i keep forgetting to do that . Sorry !

amistre64 · Answer

the longhand version, is just to setup 2 equations in 2 unknowns that match the stated points;

let y = ab^x

12 = ab^1
36 = ab^2

a = 12/b = 36/b^2

12/36 = b/b^2 .... 3 = b

anonymous · Answer

Thank you so much !

amistre64 · Answer

i prolly messed that up in there somewhere ... but im outa practice by a few decades :)

amistre64 · Answer

good luck

anonymous · Answer

Thanks :)