There are two circles whose equations are S1=x2+y2=49 and S2=x2+y2+16x – InterviewSolution

1.	There are two circles whose equations are S1=x2+y2=49 and S2=x2+y2+16x+12y+p2=0, p∈Z. If these circles have exactly two common tangents, then the sum of all the possible values of p is
Answer» There are two circles whose equations are $S_{1} = x^{2} + y^{2} = 49$ and $S_{2} = x^{2} + y^{2} + 16 x + 12 y + p^{2} = 0, p \in Z$ . If these circles have exactly two common tangents, then the sum of all the possible values of $p$ is

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