Find the difference. k k2 - 9k + 20 - 5 k2 - 9k + 20

This is the concept of algebra, to get the difference of the expression given we proceed as follows;

(k^2-9k+20) - (k^2-9k+20)

collecting like terms we get:

(k^2-5k^2) + (-9k-9k) + (20-20)

=-4k^2-18k+0

=-4k^2-18k

The answer is (-4k^2-18k)