Answer
The area of the rectangle = x^2 + 12x + 11
Step by step explanation
Here we have to use the area of rectangle formula.
Area of a rectangle = length x width
We are given length = x +1, width = x + 11
The area of the rectangle = (x + 1)(x + 11)
= x^2 + 11x +x + 11
The area of the rectangle = x^2 + 12x + 11
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