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For how many values, of p, the circle x^...

For how many values, of p, the circle `x^2+y^2+2x+4y-p=0` and the coordinate axes have exactly three common points?

Text Solution

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for circle 1
`0^2+0^2+0+0-p=0`
`p=0`
for circle 2
`g^2-c=0`and`f^2-c>0`
`1^2-(-p)=0`
`p=-1`
`4-(-p)>0`
...
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