Question

If (x-1 2) is a singular matrix , then x =
(3 4)
A) 5/2
B)-5/2
C)2/5
D)-2/5​

Answer 1

ans

Given, A=

1

1

x

−2

2

2

3

1

−3

⎤

∵ Matrix A is singular then,

∣A∣=0

⇒

1

1

x

−2

2

2

3

1

−3

=0

⇒(−6−2)+2(−3−x)+3(2−2x)=0

⇒−8−6−2x+6−6x=0

⇒−8−x=0

⇒x=

−8

8

⇒x=−1

⇒ Hence,x=−1

Answer 2

Answer:

a) Sohani

b )addtion

c)subtraction