Answer:
x^2 + 23x + 49
Explanation:
Area of rectangle = (x + 10)(2x + 5) = 2x^2 + 25x + 50
Area of square = (x + 1)(x + 1) = x^2 + 2x + 1
Area of shaded region = area of rectangle - area of square
A = (2x^2 + 25x + 50) - (x^2 + 2x + 1)
A = 2x^2 - x^2 + 25x - 2x + 50 - 1
A = x^2 + 23x + 49
Hope this help.