Jenna has a rectangular pig pen that measures 8m wide by 10m long. She wants to increase the area to 168 m^2 by increasing the length and width by the same amount. What would you enter into desmos to represent the equation?

A) x^2 + 18x – 88

B) x^2 + 10x + 80

C) (8x)(10x)-168

D) None of the above