Question
Which of the following polynomials has $(-3)$ as a zero?
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Answer
$x^2 - 9$
$x^2 - 3^2$
$= (x + 3) (x - 3) [$Using identity $a^2 - b^2 = (a + b) (a - b)]$
Then the zeroes are $x + 3 = 0$ and $x - 3 = 0$
$\Rightarrow x = -3$ and $x = 3$
$x^2 - 3^2$
$= (x + 3) (x - 3) [$Using identity $a^2 - b^2 = (a + b) (a - b)]$
Then the zeroes are $x + 3 = 0$ and $x - 3 = 0$
$\Rightarrow x = -3$ and $x = 3$
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