Juan concludes that x2 + 7x + 3 cannot be factored using integers. /1 a. Is Juan correct? Answer: Yes. /1 b. Comment on Juan’s strategy and improve it if possible. Answer: I don't know what is Juan's strategy. I only know that his answer is correct. 4. Factor each of the following expressions. /2 a. x2 + 9x + 20 Answer: (x+5)*(x+4) /2 b. 10n2 + n – 3 Answer: /2 c. 2d2 – 8de + 6e2 Answer: 2*(d-e)*(d-3e).