- #1
bradycat
- 13
- 0
Curve Sketching...
Curve Sketching stuck
Hi,
Stuck on curve sketching on the following.
You have part A which is finding the x-intercepts when y=0.
y = x^5 -5x
0=x^5-5x
x(x^4-5)=0
X=0 and then x^4=5? stuck here
Then Part b is min/max when y'=0
y'=5x^4-5
5(x^4-1)=0
5=0 CANT USE then X= ROOT of 1 comes to x= - or + 1?
Then to solve for Y it s x= 1,-4 and -1,4 ?
Part C is pts of inflection y''=0
So it's y"=20x^3
Don't know what to do here
Can some one direct me in the right direction, thanks
Joanne
Curve Sketching stuck
Hi,
Stuck on curve sketching on the following.
You have part A which is finding the x-intercepts when y=0.
y = x^5 -5x
0=x^5-5x
x(x^4-5)=0
X=0 and then x^4=5? stuck here
Then Part b is min/max when y'=0
y'=5x^4-5
5(x^4-1)=0
5=0 CANT USE then X= ROOT of 1 comes to x= - or + 1?
Then to solve for Y it s x= 1,-4 and -1,4 ?
Part C is pts of inflection y''=0
So it's y"=20x^3
Don't know what to do here
Can some one direct me in the right direction, thanks
Joanne