F(x) = x²-81
g(x) = (x-9) -1(x+9)
= (x-9) -x-9
g(x) • f(x)
= [x²-81 ] • [ (x-9) -x-9 ]
=[ x²-81 ] • [ (x-x -9-9) ]
= [ x²-81 ] •[0-18]
= [ x²-81] •[ -18]
= -18•x² +-81•-18
= -18x²+1458
Answer:
the answer is d
Step-by-step explanation:
The legs are defined by 
. The Hypotenuse if defined by 
. The perimeter is defined by:
D. P(x) = 2x √2 + 4x
