Homework Help: Algebra; HELP PLEASE.

Posted by He's not all bad like his reputation </3 on Thursday, February 2, 2012 at 6:54pm.

I don't understand the topic we're learning in math. /:

Provide an explanation, steps on how you figured the answer out, and of course, the answer.

Tell whether the table represents an exponential function. If so, write a rule for the function.
x: -2, -1, 0, 1, 2
y: 25, 5, 1, 1/5, 1/25

Algebra; HELP PLEASE. - Damon, Thursday, February 2, 2012 at 7:17pm
well, let's see if y = a^x
if x = 2, y = 1/25
so
1/25 = a^2
1/5 = a
so try
y = (1/5)^x

test x = -2
y = (1/5)^-2
y = (1)/(1/5)^2 = 1/(1/25) = 25
that sure is promising

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