find all values of x at which the tangent line to the given curve satifies given property.

y=(x^2-1)/(x+2); horizontal
can someone explain

Question

find all values of x at which the tangent line to the given curve satifies given property.

y=(x^2-1)/(x+2); horizontal
can someone explain

anonymous · Answer

Tangent line is just the derivative

anonymous · Answer

What is the derivative of given expression?

anonymous · Answer

Sorry, i have an easier method

anonymous · Answer

|dw:1412637520626:dw|
tangent line is horizontal at values of 0

anonymous · Answer

i got the derivative

anonymous · Answer

i just dont know the popints thing

anonymous · Answer

Do you see as above. Where it is a curve, the tangent line will always be horizontal

anonymous · Answer

it is a rule of tangent lines

anonymous · Answer

so its the vertex?

anonymous · Answer

Sometimes like in the problem you gave me there is more than one vertex

anonymous · Answer

Just look at the "goud" at the bottom of the parabola

anonymous · Answer

where do i get the points from?