Question

factorise,z²-8z+15
please answer this question.​

Answer 1

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$= > {z}^{2} - 8z + 15 = 0$

$= > {z}^{2} - 5z - 3z + 15 = 0$

$= > z(z - 5) - 3(z - 5) = 0$

$= > (z - 3)(z - 5) = 1$

$= > z = 3 \: and \: z = 5$