Question

identify whether (x-3) is a factor of polynomial x2- 10 x + 21 or not​

Answer 1

Answer:

=2x-10x+21

=2(3)-10(3)+21

=6-30+21

=+21+6-30

=27-30

=-3

Answer 2

Answer:

   x - 3 = 0

⇒ x = 3

P(x) = x² - 10x + 21

P(3) = 3² - 10×3 + 21

      = 9 - 30 + 21

      = 30 - 30

      = 0

∴ (x - 3)  is  a  factor  of  x² - 10x + 21 .

Step-by-step explanation: