Question

factorise the following Expression.
${z}^{2} - 12z + 27$
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Answer 1

Step-by-step explanation:

${z}^{2} - 12z + 27 \\ {z}^{2} - 9z - 3z + 27 \\ z(z - 9) - 3(z - 9) \\ ( z - 9)(z - 3)$

Answer 2

Answer:

z^2-(9z+3z)+27

Step-by-step explanation:

z^2-9z-3z+27

z(z-9)-3(z-9)

(z-3)(z-9)

z=3,9

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