Question

8) Factorised form of r2 - 10r + 21 is :
(a) (r - 1) (-4)
(c) (r - 7) (r + 3)
(b) (r - 7) (r - 3)
(d) (r + 7) (r + 3)​

Answer 1

Answer:

(b) (r-7) (r-3)

Step-by-step explanation:

r2-7r-3r+21

r(r-7) -3(r-7)

(r-3) (r-7)