I'm preparing for the SAT and tripped over the following problem:
$(x-8)(x-k) = x^2 - 5kx + m$
"In the equation above, k and m are constants. If the equation is true for all values of x, what is the value of m? A) 8 B) 16 C) 24 D) 32 E) 40 " Can someone please explain how to solve it?