Question

What is the determinant of a=
–30
–4
30
60

Answer 1

its C

Explanation:

Answer 2

Therefore the correct option is third

i.e determinant A i.e |A| = 30

Explanation:

Given:

`A=\left[\begin{array}{ccc}-2&2&b\\0&3&a\\0&0&-5\end{array}\right]`

To Find:

determinant A i.e |A| = ?

Solution:

Determinant A is given as

`|A|=-2(3* -5-0* a)-2(0* -5-0* a)+b(0* 0-0* 3)\\\\|A|=-2(-15)-2(0)+b(0)\\\\|A|=30`

Therefore the correct option is third one i.e determinant A i.e |A| = 30