The side of a square measures 3mn^2. what is the area of the square if m=4 and n= -2

Your question was wrong. I had to watch the photo.

-2²=4
4(4)=16
16(3)=48
48²=2304

When I read your text I though this:
4(-2)=-8
-8(3)=-24
-24²=576
576²=331 776

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