- #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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