Question

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

• A. $7$
• B. $2$
• C. $9$
• D. None of the above

Answer 1

Answer: (C)

$9$

Given equation is $z^3+2z^2+5z+1$

Put $z=1$, we get

$z^3+2z^2+5z+1=1^3+2\times 1^2+5\times 1+1=1+2+5+1=9$

Hence, option C is correct.