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Mathematics 22 Online
OpenStudy (lilg132):

diffrentiate

OpenStudy (lilg132):

differentiate \[y = 3x ^{3} - 4x ^{2} + 8x - 6\]

OpenStudy (anonymous):

repeated use of power rule \[\frac{d}{dx}[x^n]=nx^{n-1}\]

OpenStudy (lilg132):

i got \[y = 6x ^{2} - 8x + 2 \]

OpenStudy (lilg132):

OR IS IT + 8 ?

OpenStudy (lilg132):

no im joking lana :\

OpenStudy (lalaly):

dy/dx=9x^2-8x+8

OpenStudy (lilg132):

how?

OpenStudy (lalaly):

apply the rule satellite posted

OpenStudy (lilg132):

oooops i messed up lol one sec

OpenStudy (lilg132):

9x^2 - 8x + 8

OpenStudy (lalaly):

oki:D

OpenStudy (lilg132):

thanks but one thing im confused about

OpenStudy (lalaly):

Just a note, when u differentiate write dy/dx or y' = ...

OpenStudy (lilg132):

in the end its 8x - 6 at the end of the equation we get something like 9x^2 - 8x + 8 - 6

OpenStudy (lilg132):

so why do we leave the -6 out completely?

OpenStudy (lalaly):

because 6 is a constant and the derivative of a constant is always 0

OpenStudy (lilg132):

so do i write + c in the end or anything?

OpenStudy (lalaly):

no that is only when integrating

OpenStudy (lalaly):

for indefinite integrals only

OpenStudy (lilg132):

ok thanks alot lana

OpenStudy (lalaly):

im sorry about the first post ...

OpenStudy (lilg132):

lol dont worry

OpenStudy (anonymous):

hey lilg remember me?

OpenStudy (lalaly):

@Pippa lol

OpenStudy (lilg132):

hey pippa :D

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