We have

We know that determinant of A is calculated as

⇒ 2(1) – 4(5) = 2x(x) – 4(6)

⇒ 2 – 20 = 2x² - 24

⇒ -18 = 2x² – 24

⇒ 2x² = -24 + 18

⇒ 2x² = 6

⇒ x² = 6/2

⇒ x² = 3

x = �√3

Ans. The value of x is �√3