Final answer:
To evaluate the expression f(x) = 4 * 2^(x) for x = -1, we substitute the value of x into the expression and simplify.
Step-by-step explanation:
To evaluate the expression f(x) = 4 * 2^(x) for x = -1, we substitute the value of x into the expression:
f(-1) = 4 * 2^(-1)
Since 2^(-1) is equivalent to 1/2, we can simplify the expression to:
f(-1) = 4 * (1/2)
And further simplify to:
f(-1) = 2
Therefore, when x = -1, f(x) is equal to 2.