find the perimeter. the area is (9x^2+6x+1) side length=cx+d x=3

So the area=length^2=(cx+d)^2=9x^2+6x+1=(3x+1)^2

Therefore cx+d=3x+1

c=3, d=1

length=3x+1

When x=3, length=3*3+1=10

The perimeter=4*length=4*10=40

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