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marysya [2.9K]
2 years ago
7

If A = [

Mathematics
1 answer:
Vlada [557]2 years ago
5 0

Answer:

Hello,

Step-by-step explanation:

a)

A=\begin{bmatrix}-4 & 2 \\3 & -7 \end{bmatrix}\\\\|A|=det \ A=-4*(-7)-3*2=28-6=22\\\\

b)

Adj\ A= \begin{bmatrix}-7 & 3 \\2 & -4 \end{bmatrix}\\

c)

A^{-1}=\begin{bmatrix}\dfrac{-7}{22}  & \dfrac{2}{22}  \\\\\dfrac{3}{22}  & \dfrac{-4}{22}  \end{bmatrix}

d) Since A has an inverse, A is inversible and <u>not singular.</u>

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Answer:

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Step-by-step explanation:

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