## Algebra and Trigonometry 10th Edition

$A-\frac{8}{3}x^2+\frac{400}{3}x$
Total of fencing: $4x+3y=200$ $3y=200-4x$ $y=\frac{200-4x}{3}$ $A=2xy=2x(\frac{200-4x}{3})=\frac{400x-8x^2}{3}=-\frac{8}{3}x^2+\frac{400}{3}x$