Why is gravitational PE written as GmM/r² instead of mgh?

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Kyle Barr
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I am from New York, and a physics student. ( not trying to give to much info on the internet.) but i was curious in why people on the internet use PE equation as GmM/r^2 when i was taught that it was PE=MGH? please help me with me confusion? thank you.
 
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oops I am sorry not quite sure where I am posting just yet! haha
 

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