CPM Homework Help : A2C Problem 10-12

What is the probability that $x^{2} + 7x + k$ is factorable if $0 ≤ k ≤ 20$ and $k$ is an integer?

Hint:

First list all of the values of k for which the expression is factorable.

More Help:

$x^{2} + 7x + k$ is factorable for $k = 0$ , 6, 10, 12.

Answer:

$\text{The probability is }\frac{4}{21}\approx 19.05.$