Algebra, please help. The answer should be a polynomial in standard form.

Answer:
x² + 11x + 24
Step-by-step explanation:
We know that area of rectangle is Length x breadth.
Length = x + 3
breadth = x + 8
Now, putting the values in the formula,
(x + 3)(x + 8)
x² + 8x + 3x + 24
x² + 11x + 24
Hope it helps ^_^