Q1 Factorise the following expressions 

(I)

a ^ 2 + 8a + 16

Answers (1)

We have,
              a^2 + 8a + 16 = a^2+ 4a + 4a + 16
                                          = a(a + 4) + 4 (a+4)
                                          = (a+4)(a+4) =  (a+4)^{2}
Therefore, 
                a^2+8a+16 = (a+4)^2

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