sums and and products of roots (1 Viewer)

[waltssillyhat]

i found part a, which was -10, but i don't understand how you can use this to state the number of x-intercepts (the answer in the book says there's one intercept). any help would be appreciated

 

[tywebb]

 

[waltssillyhat]

View attachment 46909

ahhhh thank you so much <33