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# Can someone help me with my homework??

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its been bugging me for days and i really want to get my head round it. y = 5x cubed + 4 x + 13 and y = 3ex - 5x -2 and y = sin x + cos 2 x Does anyone know how this is done or kno… Read More
8y, 11m agoPosted 8 years, 11 months ago
its been bugging me for days and i really want to get my head round it.

y = 5x cubed + 4 x + 13

and

y = 3ex - 5x -2

and

y = sin x + cos 2 x

Does anyone know how this is done or know any sites that explains it? Cheers
8y, 11m agoPosted 8 years, 11 months ago
Options

(16)
banned#2
cant stand maths. i wish it died.

I wish English maths science and every subject just died. Brings back painful memories
#3
i dont mind science and english but yeh maths is the worst thing in the world
banned#4
Yup I hated maths.....liked everything else...especially Science, History & French
banned#5
w+*-n-*-e+r =

Anyone?

Oh i hate maths
#6
I have a Maths degree, but can't be asked to do this, lol.
banned#7
Abvance
I have a Maths degree, but can't be asked to do this, lol.

lol it should take u less then 2 minutes then!
#8
Abvance
I have a Maths degree, but can't be asked to do this, lol.

#9
To be honest I've forgotten how to do these and don't want to relearn it!
#10
i dont understand what you are trying to get from the equations?

are you trying to find y, or differentiate, or what?
banned#11
try an online calculator
#13
Wilko_Mat
i dont understand what you are trying to get from the equations?

are you trying to find y, or differentiate, or what?

If I remember my algebra,

its you have to resolve x, but firstly you need to 'combine' 2 of the equations to the derivative of y and then carry out a simultaneous equation to solve x and y.
#14
Alfonse
If I remember my algebra,

its you have to resolve x, but firstly you need to 'combine' 2 of the equations to the derivative of y and then carry out a simultaneous equation to solve x and y.

That will only work for linear equations, not for these though.
#15
Abvance
That will only work for linear equations, not for these though.

Yeah my algebra days are hazy, I hated dx/dy mostly.

lol
#16
Wilko_Mat
i dont understand what you are trying to get from the equations?

are you trying to find y, or differentiate, or what?

Yeah, without knowing what the equations are representing or what you're trying to do it's pretty hard to give you any help. Are the three equations even part of the same question?