If f(x) = k(x - k) and k is a constant, what is the value of f(4) - f(3), in terms of k?
(C) 7k - 1
(D) k^2 + k
(E) k^2 - k
GH-04.12.13 | OE to follow
f(4)-f(3)= [k(4-k)-k(3-k)].. taking the common k out.
= k[4-k-3+k]---- +k and -k cancelled out.
So Answer is B.
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