Question

Factorise the following using appropriate identities:
(1) 9x2 + 6xy + y2
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Answer 1

Answer....

$\tt{9x}^{2} + 6xy + {y}^{2} \\ \\ \tt\blue{[using \: identity] \: {(a + b)}^{2} = {a}^{2} + 2ab + {b}^{2} } \\ \\ \tt = {(3x)}^{2} + 2 \times 3x \times y + {(y)}^{2} = {(3x + y)}^{2}$