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Verified Answer :

Standard form:z2 + 17z + 72 = 0
Factorization:(z + 9)(z + 8) = 0
Solutions based on factorization:z + 9 = 0   ⇒   z1 = −9z + 8 = 0   ⇒   z2 = −8
Extrema:Min = (−8.5, −0.25)

Ckaranja

\(z^{2} +17z+72 Product= 72 Sum = 17\)
\(z^{2} +9z+8z+72\)
z(z+9)+8(z+9)
(z+8)(z+9)

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