see the pic to answer the question
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z²- 13z + 30 = 0
⇒ z²- 10z - 3z + 30 = 0
⇒ z(z - 10)- 3(z - 10) = 0
⇒ (z - 10) × (z - 3) = 0
⇒ z = 10 OR z = 3
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