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# A LEVEL MATHS Differentiation HELP watch

1. Differentiate
y= (4-x) / (2+root x)
i've made root x power of 1/2
then i seperated the equations
(4 / 2x^1/2) - (x / 2+x^1/2)
then i simplified them to get
(2/root x) - (1/2x^1/2)
i then differentiated dy/dx to get this
(-x^-3/2) - (1/4x^-1/2)
which is wrong
2. (Original post by AsianG99)
Differentiate
y= (4-x) / (2+root x)
i've made root x power of 1/2
then i seperated the equations
(4 / 2x^1/2) - (x / 2+x^1/2)
then i simplified them to get
(2/root x) - (1/2x^1/2)
i then differentiated dy/dx to get this
(-x^-3/2) - (1/4x^-1/2)
which is wrong
Hello! You cannot simplify the fractions as you did, when you split them you appear to have got the denominators confused.
To differentiate this you would have to use the quotient rule which is used to differentiate something that is one function divided by another.

Also if you want more help with maths in the future, try posting in the Maths Forum, you'll get assistance much faster on there!

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Updated: February 12, 2018
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