Answer:
Hello,
Step-by-step explanation:
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<u>Formula used (a+b)^2=a²+2ab+b²</u>

Here are the steps on how I did it.
478×427= 204,106cm
204,106cm - 2041.06m
204,106cm - 20.411m2
You set both expressions equal to each other, then solve for x. Your answer will be x=12