Question

Factor z2 + 17z + 72.

A. (z – 9)(z + 8)
B. (z + 9)(z – 8)
C. Not factorable
D. (z + 9)(z + 8)

Answer 1

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)

Answer 2

`z^(2) +17z+72 Product= 72 Sum = 17`

`z^(2) +9z+8z+72`
z(z+9)+8(z+9)
(z+8)(z+9)