Chapter 5 - Polynomials and Factoring - 5.3 Factoring Trinomials of the Type ax2+bx+c - 5.3 Exercise Set - Page 327: 80

2 points

I would take off two points. After all, she factors the initial expression correctly. She makes a mistake, however, at the end, for she factors a 2 out of both factors, so the whole expression should be multiplied by $2\times 2=4$. This is a minor mistake, but it certainly demonstrates a lack of understanding.