Tangents PQ and PR are drawn to the para...

Tangents PQ and PR are drawn to the parabola `y^(2) = 20(x+5)` and `y^(2) = 60 (x+15)`, respectively such that `/_RPQ = (pi)/(2)`. Then the locus of point P is

x+10=0

x+30=0

x+40=0

none of these

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OBJECTIVE RD SHARMA ENGLISH-PARABOLA-Exercise

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