TutorTeddy.com, Tutoring, Dallas, TX
Like us for free help*

Welcome to TutorTeddy.com


Ask any Statistics/Probability/Math Question

A dump of our free Chat sessions, in case it is useful. It excludes white boards used during paid sessions.





tutor3 : Hello Student, May I help you with your Math problems?
student : yes
tutor3 : say it
student : I have a question related to matrices
student : 1. Consider a kxk symmetric matrix A. a) if there exist vectors x1 and x2 such that x1'Ax>0 and x2'Ax<0, then there exist eigenvalues of A, v1 and v2, satisfying v1'Av1>0 and v2'Av2<0. Explain why.
tutor3 : is it x1'Ax or x1'Ax1?
student : x1'Ax1
student : and likewise x2Ax2<0
tutor3 : Please wait, we are helping other students
tutor3 : WILL BE BACK IN FEW SECONDS
student : ok
student : having a hard time with this one?
tutor3 : no
tutor3 : you have a bit of maths to understand
student : really
student : elaborate
tutor3 : see it is x1'Ax1>0 (eq 1) .Now from the homogenous equations we know Ax1=v1*x1 .substituting Ax1 in (eq 1) we have x1'v1*x1 >0 .Now x1'x1 is A matrix since it is symetric thus we can say v1'Av1 >0 and similarly the other follows
tutor3 : Improve your grades, get 1 hour of Math coaching only $16..
tutor3 : Fax your homework to 206-339-8302. or, email to *****@aafter.com. Include your email and phone number.
tutor3 : if you have any more questions mail us and we will solve them for you within your deadline


TutorTeddy.com & Boston Predictive Analytics

[ Email your Statistics or Math problems to tutor@aafter.com (camera phone photos are OK) ]


Boston Office (Near MIT/Kendall 'T'):
Cambridge Innovation Center,
One Broadway, 14th Floor,
Cambridge, MA 02142,
Phone: 617-395-8864


Dallas Office (Near Galleria):
15950 Dallas Parkway,
Suite 400,
Dallas, TX 75248,
Phone: 866-930-6363

Copyright 2011 tutorteddy.com. All Rights Reserved. | By using our site, you agree to our TOS.