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Factorise: 9 + 6z + z^2

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Factorise: 9 + 6z + z2

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We rewrite it as z2 + 6z + 9 

We solve by using the formula (a+b)2 = a2 + b2 + 2ab We get, 

z2 + (3)2 + 2 (z) (3) = (z+3)2

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