Given the expression:

`-5a^2`

We need to find the value of the expression when `a= -2`

Then, we will plug in `a= -2` into the expression.

`==gt -5a^2 = -5(-2)^2`

Now we will simplify and find the value.

`==gt -5a^2 = -5(4) = -20`

** Then, the value of the expression...**

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Given the expression:

`-5a^2`

We need to find the value of the expression when `a= -2`

Then, we will plug in `a= -2` into the expression.

`==gt -5a^2 = -5(-2)^2`

Now we will simplify and find the value.

`==gt -5a^2 = -5(4) = -20`

**Then, the value of the expression -5a`^2` when a= -2 is -20.**