Question 1(iii)
Factorise the following expressions
$25 m^{2} + 30 m + 9$

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Solution

$25 m^{2} + 30 m + 9 = (5 m)^{2} + 2 \times 5 m \times 3 + (3)^{2} = (5 m + 3)^{2} [(a + b)^{2} = a^{2} + 2 a b + b^{2}]$

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