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Answer:
- length: 10 +2x inches
- width: 8 +2x inches
- area: 4x^2 +36x +80 square inches
Explanation:
The frame adds x to the picture on each side, so adds 2x to the length and 2x to the width.
The length is 10 + 2x.
The width is 8 + 2x.
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The area is the product of length and width:
A = LW = (2x +10)(2x +8) = 4x^2 +16x +20x +80
Area = 4x^2 +36x +80 . . . square inches