Q8 of 127 Page 108

If , then x is equal to

We have

We know that determinant of A is calculated as


⇒ x(x) – 2(18) = 6(6) – 2(18)


⇒ x2 - 38 = 36 – 38


⇒ x2 =36 – 38 + 38


⇒ x2 = 36


⇒ x = �6

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