Question 1(i)
Factorise the following expressions :
$a^{2} + 8 a + 16$

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Solution

$a^{2} + 8 a + 16 = (a)^{2} + 2 \times a \times 4 + (4)^{2} = (a + 4)^{2} [∵ (x + y)^{2} = x^{2} + 2 x y + y^{2}]$

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