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Factorisation Using Algebraic Identities

Factorise: 9+...

Question

Factorise:
$9 + 6 z + z^{2}$

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Solution

$9 + 6 z + z^{2} = (3)^{2} + 2 \times 3 \times z + (z)^{2} = (3 + z)^{2} A n s .$

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