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Sagot :
Answer:
Step-by-step explanation:
z^2+9z+20
=z^2+(5+4)z+20
=z^2+5z+4z+20
=z(z+5)+4(z+5)
=(z+5)(z+4)
Please mark me brainliest if it helps you
z^2 + 9z + 20
z^2 + 5z + 4z+ 20
z(z + 5) + 4 (z+5)
(z+5) (z+4)
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