Step-by-step explanation:

4x - 8, 4x just means four of x, and eight less means to subtract 8.

<u>The answer is...</u>
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<u>Hopefully, this helps you!!</u>
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0, adding it in and then subtracting it out cancels both out
The answer is A=81. You multiply 9 x 9 and then you get 81. Since all sides on a square are equal, you multiply the side length by itself to get the area. Hope that helps! Have a great day!