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(Solved): A=([-2,-3,4],[3,4,-5],[3,5,-6]),B=([2,x,y],[9,2,-4],[8,3,-2]),(x,yinR) Find x and y such that AB is ...



A=([-2,-3,4],[3,4,-5],[3,5,-6]),B=([2,x,y],[9,2,-4],[8,3,-2]),(x,yinR)

Find

x

and

y

such that

AB

is a triangular matrix. Write down this triangular matrix and give its determinant. Without any additional calwlations, deduce that

A

is invertibte.



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