Answer:
[tex]5x^2 +x - 14[/tex]
Step-by-step explanation:
The area of the grass left will be the area of the total of the background subtract the area of the patio.
The area of the backyard is [tex](3x+5)(2x-1) = 6x^2 +7x - 5[/tex]
The area of the patio is [tex](x+3)(x+3) = x^2 + 6x + 9[/tex]
Subtract the two areas to have the area of the leftover grass.
[tex]6x^2 + 7x - 5 - (x^2 + 6x + 9)\\5x^2 +x - 14[/tex]
