Answer to Question #67830 in Linear Algebra for jasonchi

Question #67830

1) given that A1=2i-j+k, A2=i+3j-2k, A3=3i+2j+5k, and A4=3i+2j+5k
find scalars a,b,c such that A4=aA1+bA2+cA3.

2) if a and b are non-collinear vectors and A=(x+y)a+(2x+y+1)b

3) given the scalar defined by phy(x,y,z)=3x^2-xy^2+5

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