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Solution:
[a ( a - 7 ) ]^1/2 =3*2^1/2
Squaring both side we get
a (a -7) =9*2
a^2 - 7*a -18 = 0
a^2 - 9a + 2a -18 =0
(a + 2) (a - 9) = 0
(a+2) =0 OR (a - 9 ) =0
a = - 2 OR a = 9