How do you find the zeros of $y = (x + 2)(x − 4)(x + 1)$ ?

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Answer 1 · 2016-06-24T22:19:30

$x=-2$ , $x=4$ and $x=-1$

A product of three numbers is zero if and only if at least one of the numbers is zero.

In our example:

$y = (x+2)(x-4)(x+1)$

So $(x+2)(x-4)(x+1)=0$ if and only if at least one of the following holds:

So the three zeros are: $x=-2$ , $x=4$ and $x=-1$

How do you find the zeros of y = (x + 2)(x − 4)(x + 1)y = (x + 2)(x − 4)(x + 1)?