How do you evaluate the expression for 8*3^x if x=-2 and if x=3?

1 Answer
Jan 6, 2017

See full explanation below.

Explanation:

For each of these you Substitute the value for x in the expression.

Problem 1: Solve for x = -2

8 * 3^(-2)

We can use this rule for exponents to rewrite this problem:

x^color(red)(a) = 1/x^color(red)(-a)

8*1/3^color(red)((- -2))

8*1/3^color(red)(2)

8*1/9

8/9

Problem 1: Solve for x = 3

8 * 3^3

8*27

216