Question

q2-10q+21what is the answer of this​

Answer 1

Answer:

(q-3) (q-7)

Step-by-step explanation:

q² - 10q + 21 = q² - (7+3)q + 21

                    = q² -7q - 3q + 21

                    = q (q-7)-3(q-7)

                    = (q-7) (q-3)

Answer 2

q²  - 10q + 21

Product = 21, Sum = -10

21 = -3 -7

∴ q² -3q - 7q + 21

  q(q-3) -7(q-3)

  (q - 7) (q - 3)

⇒ q = 7, q = 3