Question

The output of $z^3+2z^2+5z+1$, where $z=-1$

• A. $-1$
• B. $-2$
• C. $-3$
• D. None of the above

Answer 1

The correct option is C $-3$

$z^3+2z^2+5z+1$
$=(-1{)}^3+2\times (-1{)}^2+5\times (-1)+1$
$=-1+2-5+1$
$=-3$