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Question: Error, attempting to assign to "D" which is protected.

Question:Error, attempting to assign to "D" which is protected.

Syeda 30
error student warning
January 17 2014
0

While solving cubic formula, i got this warning in Maple.

Why D variable is protected? 

eq1 := A*x^3+B*x^2+C*x+D = 0

``

A := x^2:

B := 2*x*y-4*z^2:

C := -2*x*y*z+x^2-y*z:

D := 4*x^2-x*z

Error, attempting to assign to `D` which is protected.  Try declaring `local D`; see ?protect for details.

  

``

eq1

x^5+(2*x*y-4*z^2)*x^2+(-2*x*y*z+x^2-y*z)*x+D = 0

 (1)

 

 
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