What two values can d have if d2 (squared) = 9?

d = 3  &  d = -3

Step-by-step explanation:

the equation to solve is  

Let's remember some properties of numbers and radicals.

Let's take the number 2 for example.

We know  

Also

as well

Since negative TIMES negative also gives us positive.

How do we get the reverse answer? Simple. We square root it. So we would have:

and

-2, since we now know this.

Let's do this process and take square root of our equation to get:

and also d = -3

Hence, two values of d are  d = 3  &  d = -3

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