Question

Lost on a derivs question

Answer 1

Okay, find the points on the graph which the tangent line is horizontal.

Answer 2

y=4/3x^3-7x+3

Answer 3

SO YOU TAKE Y=4/3X^3-7X+3 AND FIND THE DERIV

Answer 4

And you get -4/x^4-7

Answer 5

So then you're supposed to set that equal to zero

Answer 6

-4/x^4-7=0

Answer 7

and then I get lost

Answer 8

@jim_thompson5910 save my day

Answer 9

And I get it, it's a cubic so the points are right here