- #1
TheoehT
- 11
- 0
I'm having trouble with this question, because the 1/3 power is making my life very difficult! I don't have class for the next couple of days and without a teacher to ask, the question's driving me crazy!
the question is find the stationary points for y = (8 +5x^2)^1/3
using algebraic calculus
I was able to find the derivative,
dy/dx = 1/3(8+5x^2)^-2/3 times 10x
= 10/3(8+5x^2)^-2/3
= 10x (above)
3(8+5x^2)^2/3
I also know to make dy/dx = 0, but when I try to work it out I somehow get to 392^3/2 + 15x^11/2 - 10x = 0
I have no idea how I got there! I'm really confused over the fractional power, and no examples I have with me deal with it!
If anyone could help in some way, I'd really appreciate it.
Thanks.
the question is find the stationary points for y = (8 +5x^2)^1/3
using algebraic calculus
I was able to find the derivative,
dy/dx = 1/3(8+5x^2)^-2/3 times 10x
= 10/3(8+5x^2)^-2/3
= 10x (above)
3(8+5x^2)^2/3
I also know to make dy/dx = 0, but when I try to work it out I somehow get to 392^3/2 + 15x^11/2 - 10x = 0
I have no idea how I got there! I'm really confused over the fractional power, and no examples I have with me deal with it!
If anyone could help in some way, I'd really appreciate it.
Thanks.
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