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Question: Correct upto 7 decimal figurs (not significant digits)

Question:Correct upto 7 decimal figurs (not significant digits)

pallav 90
analysis
January 11 2013
2

I have the following expression 

lambda1-2.9881355172134833*lambda2+16.044692204509636*lambda1^2-114.31727386075951*lambda1*lambda2+202.36051939112247*lambda2^2

 

I want to get the expression in a form in which all the coeffs are fixed to 7 decimal places. 

 

I have tried with 

evalf[7](lambda1-2.9881355172134833*lambda2+16.044692204509636*lambda1^2-114.31727386075951*lambda1*lambda2+202.36051939112247*lambda2^2)

 

But it does not corrected the figures up to 7 decimal places rather upto 7 significant digits. Help me to solve the issue.
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