Question 711398
Determine whether the number -6 is a zero of F(x)=x^3+2x^2-40x+64. If it is, find the other real zeros?
-----
Use synthetic division:
-6)....1....2....-40....64
.......1....-4...-16...|..160

---
Since f(-6) is not zero, -6 is not a zero.
=========================================
Cheers,
Stan H.