Your question seem to me non-understandable. Are they adding up together ?
or multiplying ?
Answer:
Tangent segment ? I think. I don't know for sure because of the way you wrote the question- I got a bit confused.
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No solution / no x
D=b^2-4*a*c -> D=-4^2-4*1*21 -> D=-28 -> D<0, no solution
