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Z11
 4 years ago
Find a nonzero, twobytwo matrix such that:
[6, 5] x [__, __] = [0, 0]
[24, 20] [__, __] [0, 0]
These are all 2x2 matrices.
How do we find the missing numbers?
Z11
 4 years ago
Find a nonzero, twobytwo matrix such that: [6, 5] x [__, __] = [0, 0] [24, 20] [__, __] [0, 0] These are all 2x2 matrices. How do we find the missing numbers?

This Question is Closed

dave444
 4 years ago
Best ResponseYou've already chosen the best response.3Not true. \[\left[\begin{matrix}5 & 5 \\ 6 & 6\end{matrix}\right]\] will do the trick.

dave444
 4 years ago
Best ResponseYou've already chosen the best response.3Wondering how I obtained the above answer? Simply carry out the following matrix multiplication: \[\left[\begin{matrix}6 & 5 \\ 24 & 20\end{matrix}\right]\left[\begin{matrix}a & b \\ c & d\end{matrix}\right]= \left[\begin{matrix}0 & 0 \\ 0 & 0\end{matrix}\right]\] You'll get two systems of two equations in two unknowns. The first two will involve a and c the second b and d. They are homogeneous equations (right hand sides are zero), but they are dependent (one equation in a pair is a multiple of another.) So we can let one of the variables be a parameter and solve for the other. There are an infinite number of solutions. Any multiple of the matrix I gave will also work.
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