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Unattributed TMUA Mock Set A Paper 1 · Q6

Paper 1Geometry

If the circle C:(x−1)2+y2=1C:(x-1)^2+y^2=1 is tangent to the circle C2:x2+y2−8x+8y+m=0C_2:x^2+y^2-8x+8y+m=0, then the value of mm can be

A16 or −416\text{ or }-4
B7 or −77\text{ or }-7
C7 or −47\text{ or }-4
D16 or −716\text{ or }-7
E4 or −44\text{ or }-4
F16 or −1616\text{ or }-16

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