Laura27 Posted May 7, 2011 Report Share Posted May 7, 2011 (edited) They give me two matrices:Matrix C = (a= -2)(b=4) (c=1)(d=7)Matrix D = (a=5) (b=2) (c=-1) (d= x)Instructions are: "Matrix Q is such that 3Q = 2C - D", FIND QIf there is a matrix with "x", and no matrix as Dhow do I solve this?? Edited May 7, 2011 by Laura27 Reply Link to post Share on other sites More sharing options...
iber2011 Posted May 7, 2011 Report Share Posted May 7, 2011 But i think they should've given D or Q atleast. How are you supposed to solve then by 'assuming' what Q is?? Reply Link to post Share on other sites More sharing options...
timtamboy63 Posted May 7, 2011 Report Share Posted May 7, 2011 There MUST be a typo. Btw, are you sure your matrix B isn't actually matrix D?Even if it is however, there is not enough info, unless they want you to find Q in terms of x?Is this definitely the complete question? Reply Link to post Share on other sites More sharing options...
Laura27 Posted May 7, 2011 Author Report Share Posted May 7, 2011 Oh, yes it was matrix D instead of Bhowever those are the only two matrix given and they are not asking for Q in terms of "x" Reply Link to post Share on other sites More sharing options...
timtamboy63 Posted May 7, 2011 Report Share Posted May 7, 2011 Hm, well then there must be some way to find x, could you maybe scan the problem or something? Reply Link to post Share on other sites More sharing options...
Laura27 Posted May 7, 2011 Author Report Share Posted May 7, 2011 (edited) Right now I am not able to...anyway they just give those instructions and no extra information. Well, only "The matrix 2×2Q is such that 3Q=2C-D" and both matrix (C and D)But I do not think that "2 × 2Q" changes something, or it does?(By 2×2 they concern to the size/dimension of the matrix) Edited May 7, 2011 by Laura27 Reply Link to post Share on other sites More sharing options...
iber2011 Posted May 7, 2011 Report Share Posted May 7, 2011 (edited) Well i think the question only asks you to find Q soo it like 3Q= [1 6 ] and so Q= [1/3 2] [3 14-x] [1 14-x/2] Do you have the answers?? Edited May 7, 2011 by iber2011 Reply Link to post Share on other sites More sharing options...
IB>mindf**k Posted May 24, 2011 Report Share Posted May 24, 2011 (edited) Assuming they want us to find Q in terms of both nrs and x´s, then 3Q=2C-D Where C and D are given in the first post we say that 2C-D=P So 3Q=P P=(a=-9, b=6, c=1 and d=14-x) by 2C-D Q=1/3*P so Q=(a=-3, b=2, c=1 and d=((14-x)/3) Note that I assumed that x is to be x and not any other nr because our math teacher showed us a matrix question from an old exam whose answer was given like that, and it did not say anything about giving the answer in terms of x in that question.Hope this helps Edited May 24, 2011 by mhmd123 Reply Link to post Share on other sites More sharing options...
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