Question

Find the values of following determinants

1) -1 7
2 4

Answer 1

The answer is may be -18

Answer 2

Answer:

$-18$

Step-by-step explanation:

$\left[\begin{array}{ccc}-1&7\\2&4\end{array}\right] \\\\=-1(4)-7(2)\\=-4-14\\=-18$