8. If , then x is equal to (A) 6 (B) ± 6 (C) – 6 (D) 0

8. If

, then x is equal to

(A) 6                (B) ± 6                        (C) – 6                        (D) 0

x(x) – 2(18)    = 6(6) – 18(2)

x² – 36           = 36 – 36

x²          = 36

x          = ±6

Hence option B is correct