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Solve the equation by factorization method.

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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

Posted by

rishi.raj

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