Question

Please help
Which determinant has a value of 2?

a.det [-7 9]
[1 1]

b.det [7 9]
[1 1]

c.det [7 -9]
[1 1]

d.det [-7 -9]
[1 1]

Answer 1

a) has the value of 2
Here's an example determinant:
a b
c d
the value of a determinant is
a * d - c * b
Only choice "a" evaluates as 2

Answer 2

@wolf1728 so the answer is A