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i think that's y=x^2 +C, right ?

yes, thats what I was thinking, do they mean y=x^2 +C

did u get it?

y=2x+3...........i
y=x^2+C........ii

Now, substitute eqn i in eqn ii and tell me what u get

If you want to see the calculation look at the attached file.

thank you very much guys for the help! can I ask why is the D=0 (D=discriminant)?