Matrix Questions: Addition, InverseDate: 8/6/96 at 21:31:52 From: Anonymous Subject: Matrix Questions: Addition, Inverse Hello, Please tell me how to solve these problems: i) (1 2) + (-1 -2) =? ii) If A = (3 4), is it A inverse? Date: 8/7/96 at 9:2:54 From: Doctor Anthony Subject: Re: Matrix Questions: Addition, Inverse i) (1 2) + (-1 -2) =? When you add matrices, (or in this case row vectors), you simply add the corresponding terms in each matrix. So (1 2) + (-1 -2) = (1-1 2-2) = (0 0) ii) If A = (3 4), is it A inverse? To have an inverse, A must be a square matrix, i.e. the same numbers of rows and columns. -Doctor Anthony, The Math Forum Check out our web site! http://mathforum.org/dr.math/ |
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