Question

Find the value of the following determinant. *

-1 7
2 4 ​

Answer 1

Answer:

if any determinant A is written as

\begin{gathered}A = |\begin{array}{cc}a&b\\c&d\end{array}|\end{gathered}

A=∣

a

c

b

d

∣

then, modulus of A or, value of A is given by

multiply of a and d - multiply of b and d

e.g., |A| = ad - bc

use this concept here,

Given,

\begin{gathered}A= |\begin{array}{cc}-1&7\\2&4\end{array}|\end{gathered}

A=∣

−1

2

7

4

∣

|A| = (-1) × 4 - 7 × 2 = -4 - 14 = -18

hence,value of determinant = -18

Answer 2

Answer:

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