Written Explanation/Analysis: Since this is a simple polynomial expression, we can factor it easily by finding two numbers whose product is the third term, -36, and whose sum is 5, the coefficient of the middle term. To further explain, the two numbers being 9 and -4 means when I multiply them together the product is -36, the third term. And when I add them together, 9 + (-4), the answer is 5, which is the coefficient of the middle term.