Help with maths homework please :D

Mason-

Mason-

Mason-

Soldato
Joined
18 Jun 2010
Posts
6,853
Location
Essex
got this question...

y = root(3x-1) + 4/root(3x-1)

show that
dy/dx = 9x - 15 / 2(3x - 1) ^ 3/2

So far I have differentiated it to:

dy/dx = 1.5(3x - 1) ^ -1/2 + -6(3x - 1) ^ -3/2

dy/dx = 3 / 2(3x - 1) ^ 1/2 + -6 / (3x - 1) ^ 3/2




Here you go




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anyone know where to go next?
 
Last edited:
You've done the work really, just multiply the top and bottom of the first part of your answer by 3x-1 and the top and bottom of the second part by 2. This gets the common denominator and the required answer. Also you made a typo with the minus sign before the 3/2 power on the last line. Shouldn't be there.
 
Last edited:
nydryl said:
You've done the work really, just multiply the top and bottom of the first part of your answer by 3x-1 and the top and bottom of the second part by 2. This gets the common denominator and the required answer. Also you made a typo with the minus sign before the 3/2 power on the last line. Shouldn't be there.
Click to expand...

haha! :)

thanks.
 
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