Answer:
x=10 yards
Explanation:
66=(x+12)(x-7)
66=x²-7x+12x-84
66=x²+5x-84
0=x²+5x-84-66
0=x²+5x-150
0=(x+15)(x-10)
x+15 = 0 or x-10=0
x=-15 or x=10
It can't be -15 as both sides would have negative lengths which is impossible so it has to be 10.
x+12 = 10+12 =22
x-7 = 10-7 = 3
22*3 = 66