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Mathematics: Post your doubts here!

R_Ma7mooD

R_Ma7mooD

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guys in finding dx/dy of y= 12/3-2x
I got an answer of 24/4x^2-12x+9
and the marking scheme shows -12(3-2x)^-2*-2
both give the same answer but will my answer be counted?
 
Ram97

Ram97

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R_Ma7mooD said:
guys in finding dx/dy of y= 12/3-2x
I got an answer of 24/4x^2-12x+9
and the marking scheme shows -12(3-2x)^-2*-2
both give the same answer but will my answer be counted?
Click to expand...
You have expanded your answer while the ms hasn't
Yes you're answer will be counted but its better to leave your answer simplified
 
B

BhaiArshad

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asadalam said:
Why is the ans -√x+2 and not the positive root?
View attachment 52990
Click to expand...
The Sarcastic Retard said:
Which year?
Click to expand...
It's 9280 Math Specimen Paper 1 - 2013.
First the Graphs of h(x) and inverse:
W3c2vT5.jpg


Since x is always negative in h(x)
so inverse value must always be negative so negative sign was used.
 
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