amy0799 one year ago Determine the point at which the graph of the function below has a horizontal tangent line. y = 8x^2 + 8 x= ?

1. Loser66

take derivative of y, what do you get?

2. amy0799

@Loser66 16x

3. Loser66

when it is =0?

4. amy0799

I don't know...

5. Loser66

|dw:1440972769588:dw|

6. amy0799

0

7. Loser66

8. amy0799

what do you mean both sides?

9. Loser66

|dw:1440972865500:dw|

10. Loser66

Got it?

11. amy0799

12. Loser66

yup

13. amy0799

thank you! can you help me with another?

14. amy0799

@Loser66

15. Loser66

not sure. have to see it first

16. amy0799

Find k such that the line y = 2x + 18 is tangent to the graph of the function below. $y=k \sqrt{x}$ k=?

17. Loser66

take derivative of the curve y = ksqrt x, what do you get?

18. amy0799

1/2k^-1/2

19. amy0799

@Loser66

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