Wednesday 24 April 2013

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 
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