Posted by Lilly on Monday, November 14, 2011 at 12:41am.
3 ( x + 4 ) ^ 2 = - 27 Divide both sides with 3
( x + 4 ) ^ 2 = - 9
The left hand side is a perfect square,so you can apply the square root method :
x + 4 = + OR - sqrt ( - 9 )
x = + OR - sqrt ( - 9 )- 4
( Remark:
sqrt ( - 9 ) = sqrt ( - 1 * 3 ^ 2 ) =
+ OR - 3i
where i = Imaginary unit = sqrt ( - 1 )
)
x = + OR - ( 3 i ) - 4
post it.
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