Question 114048
how do you graph {{{y = -2*5^x}}} ?

Let x be -3, then {{{y = -2*5^(-3) = -.016}}}
So plot the point (-3,.016)

Let x be -2, then {{{y = -2*5^(-2) = -.08}}}
So plot the point (-2,.08) 

Let x be -1, then {{{y = -2*5^(-1) = -.4}}}
So plot the point (-1,.4)

Let x be 0, then {{{y = -2*5^(0) = -2}}}
So plot the point (0,-2)

Let x be 1, then {{{y = -2*5^(1) = -10}}}
So plot the point (1,-10)

Let x be 2, then {{{y = -2*5^(2) = -50}}}
So we would plot the point (2,-50) if we
had big enough graph.

Draw a smooth line through those points and
it will look like this:

{{{graph(500,468.75,-5,5,-25,5,-2*5^x)}}}

Edwin