SOLUTION: I need help using the square root property to solve this equation. Thanks! (z-3)^2=-18

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Question 194264: I need help using the square root property to solve this equation. Thanks!
(z-3)^2=-18
Answer by checkley77(12569) About Me  (Show Source):
You can put this solution on YOUR website!
(z-3)^2=-18
z^2-6z+9+18=0
z^2-6z+27=0
x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
z=(6+-sqrt[6^2-4*1*27])/2*1
z=(6+-sqrt[36-108])/2
z=(6+-sqrt-72)/2
z=(6+-8.485i)/2
z=6/2+-8.485i/2
z=3+-4.2426i ans.