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i know..

complete the squares and equate the centre.

Please demo how you'd complete the square: x^2 + 6x

i think its a..?

-8

have you solve them :
-a/2 = 4
a = ...
-b/2 = -8
b = ...

-16 - 8.

oh... positive 8?

radius=\[\sqrt{g^2+f^2-c}\]

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