Factorize:
q2 – 10q + 21
Given,
Now first find the numbers whose-
Sum = - 10 and
Product = 21
Required numbers are 7 and 3,
So we get;
= q2 – 7q – 3q + 21
= q(q – 7) – 3(q – 7)
= (q – 7)(q – 3)