q5) Factorise the following expression  

ii)

q ^ 2 - 10 q + 21

Answers (1)

We have, 
              q ^ 2 - 10 q + 21  =  q^{2} - 7q -3q + 21
                                             = q(q - 7) -3(q - 7)
                                             =(q - 7)(q - 3)
Therefore,
                q ^ 2 - 10 q + 21=(q - 7)(q - 3)

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