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

Answer 1

Tangent line is just the derivative

Answer 2

What is the derivative of given expression?

Answer 3

Sorry, i have an easier method

Answer 4

tangent line is horizontal at values of 0

Answer 5

i got the derivative

Answer 6

i just dont know the popints thing

Answer 7

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

Answer 8

it is a rule of tangent lines

Answer 9

so its the vertex?

Answer 10

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

Answer 11

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

Answer 12

where do i get the points from?