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RadEnBest ResponseYou've already chosen the best response.2
i think that's y=x^2 +C, right ?
 one year ago

RadEnBest ResponseYou've already chosen the best response.2
if yes, first take y1=y2, we get a quadratic equation and then to find value of c, take D=0 (D=discriminant) solve for c?
 one year ago

heedcomBest ResponseYou've already chosen the best response.0
yes, thats what I was thinking, do they mean y=x^2 +C
 one year ago

sauravshakyaBest ResponseYou've already chosen the best response.0
y=2x+3...........i y=x^2+C........ii
 one year ago

sauravshakyaBest ResponseYou've already chosen the best response.0
Now, substitute eqn i in eqn ii and tell me what u get
 one year ago

TomLikesPhysicsBest ResponseYou've already chosen the best response.1
If you want to see the calculation look at the attached file.
 one year ago

dan18Best ResponseYou've already chosen the best response.0
thank you very much guys for the help! can I ask why is the D=0 (D=discriminant)?
 one year ago

amorfideBest ResponseYou've already chosen the best response.0
descriminant is 0 because it is a tangent to the curve, when the descriminant is 0 it has a repeated root, so it just touches the curve, if it were to be greater than 0 it would have two roots which means it would no longer be a tangent, if it were less than 0 it would have two complex roots, not being a tangent,
 one year ago
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