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if y = 8' and z= the square root of 73 what is the lenght of x

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1 Answer

Assuming z is the hypotenuse of a right triangle and not the 3rd dimension,
 
z = sqrt(73) = sqrt(x^2 + 8^2)
 
x^2 + 8^2 = 73
 
x^2 = 73 - 64 = 9
 
|x| = 3 is the length of x.
 
If x has direction it could be ±3.