Quote:
Originally Posted by VonNemo19  Yeah, the codition a>0 says that, but  , therefore   0. Mr. Fantastic understands better than I. I'm like you. I'd like to know what's going on here. |
But note that
never touches the parabola! As mr fantastic said, consider another arbitrary point
. Find the slope of the tangent at
, and then use the point
to construct the slope of the tangent line through that point and the equation of the tangent line (all in terms of
).
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