Question

Find all zeros of p(z)=9z3-27z2-100z+300.

Answer 1

Answer:

$9z \times 3 - 27z \times 2 - 100z + 300 = 0 \\ 27z - 54z - 100 z - 300 = 0 \\ 27z - 154z - 300 = 0 \\ - 127z= 300 \\ - z = \frac{300}{127} \\ z = - 2.36$