MCQ
Is $x=-2$ a zero of the polynomial $p(x)=x^2-2 x+8$ ?
- AYes
- ✓No
- CMay or may not be
- DCan't be determined
✓
Answer
Correct option: B.
No
If $x=-2$ is a zero of $p(x)=x^2-2 x+8$, then $p(-2)$
$=0$.
$\therefore p(-2)=(-2)^2-2(-2)+8$
$=4+4+8=16 \neq 0$
Thus, $x=-2$ is not a zero of $p(x)$.
$=0$.
$\therefore p(-2)=(-2)^2-2(-2)+8$
$=4+4+8=16 \neq 0$
Thus, $x=-2$ is not a zero of $p(x)$.
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