Question

Y = f(x) = 4^x

Find f(x) when x = -1.
Express as a decimal, rounding to the nearest
thousandth.

Answer 1

0.250

Explanation:

f(x) = 4^x

x = -1

f(x) = 4^-1

= ¼

= 0.250

Answer 2

.25

Explanation:

f(x) = 4^x

Let x = -1

f(-1) = 4^-1

The negative in the exponent moves the number from the numerator to the denominator

f(-1) = 1/4

We want the number in decimal form

1/4 *25/25 = 25/100 = .25