Q. 84.2( 12 Votes )

Factorize:

q2 – 10q + 21

Answer :

Given,


q2 – 10q + 21


Now first find the numbers whose-


Sum = - 10 and


Product = 21


Required numbers are 7 and 3,


So we get;


q2 – 10q + 21


= q2 – 7q – 3q + 21


= q(q – 7) – 3(q – 7)


= (q – 7)(q – 3)


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