find the value of x and the value of y when dy/dx = 0
ok, so i've found dy/dx to be
but i'm having trouble evaluating for dy/dx = 0.
I get to but am unsure of how to solve this. (also have i multiplied through by x^2 properly?)
Raise both sides to the power 2/5 .
EDIT: And yeah your rearranging and multiplication of x^2 is fine.
i get x = 4, is that correct?
You know from rules of indices that x^5/2 is the square root of x to the power of 5 so take the 5th root of 32 and you have the square root of x
ahh i get that now, thank you
Thanks for posting! You just need to create an account in order to submit the post
Already a member?
Oops, something wasn't right
please check the following:
Not got an account?
Sign up now
© Copyright The Student Room 2015 all rights reserved
The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.
Register Number: 04666380 (England and Wales), VAT No. 806 8067 22
Registered Office: International House, Queens Road, Brighton, BN1 3XE