MCQ
Which of the following polynomials has $(-3)$ as a zero$?$
- A$x^2+3$
- B$x^2-3 x$
- ✓$x^2-9$
- D$(x-3)$
✓
Answer
Correct option: C.
$x^2-9$
$x^2-9$
$x^2-3^2$
$=(x+3)(x-3)\left[\text { Using identity } a^2-b^2=(a+b)(a-b)\right]$
Then the zeroes are $x + 3 = 0$ and $x - 3 = 0$
$\Rightarrow x = -3$ and $x = 3$
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