Question

1) r^2 + 10r + 21
plz show all work or it won't count plz I need this ​

Answer 1

Answer:

r = -7

r = -3

Step-by-step explanation:

r² + 10r + 21

(r + 7)(r + 3)

= r² + 3r + 7r + 21

= r² + 10r + 21

r + 7 = 0

r = -7

r + 3 = 0

r = -3