Question 1(i)

Use a suitable identity to get each of the following products:
$(x + 3) (x + 3)$

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Solution

$(x + 3) (x + 3) = (x + 3)^{2}$
$= (x)^{2} + 2 \times x \times 3 + (3)^{2}$ $[U s i n g t h e i d e n t i t y (a + b)^{2} = a^{2} + 2 a b + b^{2}]$
$= x^{2} + 6 x + 9$

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