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Factorise: z^2 +12z +27

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Factorise: z2 +12z +27

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First find the two numbers whose sum =12 and product = 27

Clearly, the numbers are 9 and 3

∴ we get, z2 +12z + 27 

= z2 + 9z + 3z + 27

= z (z+9) + 3(z+9)

= (z+3) (z+9)

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Factorise: 12x^2 -27
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