Where can i find online people that adore solving problems in maths?something like chat!!!

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  Where can i find online people that adore solving problems in maths?something like chat!!!
  by mura22 on November 9th, 2008 | 6 people like this

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  Give me a vector that is perpendicular to the plane defined by 2i+3j+4k and 3i-4j+k
  by WarHorseLeBron on September 8th, 2010 | 1 person likes this

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  What do vector dot products and cross products calculate?
  by WarHorseLeBron on September 5th, 2010 | 1 person likes this

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  Let C be the matrix C=1,2 2,2 a.find the determinant of c b.find C to the power of -1 c. calculate C to the power of 2 = C xC d. calculate (C -1)square and (Csq)-1 and check they r the same
  by Rindell on March 18th, 2009 | 1 person likes this

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  Prove that for any 2 vectors, U and V, we get ||U+V||^2 + ||U-V||^2 = 2(||U||^2 + ||V||^2). I have proven this with simple algebra. But what geometric fact does it prove?
  by addle_brains on March 19th, 2009 | 1 person likes this

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