If f(x) = k(x - k) and k is a constant, what is the value of f(3) - f(2), in terms of k? Choose the correct choice
A) 1
B) k
C) 7k - 1
D) k^2 + k
E) k^2 - k
First, distribute f(x). k(x - k) = kx - k^2. Now evaluate f(3) and f(2):   f(3) = k(3) - k^2 = 3k - k^2   f(2) = 2k - k^2   f(3)-f(2)=k .. Answer k
<result>B</result>
If f(x) = k(x - k) and k is a constant, what is the value of f(3) - f(2), in terms of k?