Question

Is this matrix invertible

Answer 1

@freckles

Answer 2

\[A=\left[\begin{matrix}6 & -4 \\ -9& 6\end{matrix}\right]\]

Answer 3

Yes, because its determinant is not equal to zero.
Yes, because its determinant is greater than zero.
No, because its determinant is zero.
No, because its determinant is less than zero.
No, because its determinant is not equal to zero.

Answer 4

determinant is 0

Answer 5

Is it C?

Answer 6

so we have
\[A=\left[\begin{matrix}a & b \\ c& d\end{matrix}\right]\]
if a*d-b*c=0 then it is not invertible

Answer 7

so yep you are right again