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Answer:
Solution given;
A(x1,y1)=(7,4)
B(x2,y2)=(-8,4)
distance AB=?
we have
d=
AB=
AB=15 units
the distance between the two points is 15 units.
Set . Find the tangent line
to
at the point when
:
(slope of
)
Set , the root of
. The tangent line
to
at
has slope and thus equation
which has its root at .
(The actual value of this root is about -0.6777)