a wee bit stuck Given f(x) = 5 + 7x – x^4, find f ' (x). Use your result to find f ' (2) im not sure what to do at all.
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Originally Posted by Koops a wee bit stuck Given f(x) = 5 + 7x – x^4, find f ' (x). there is a rule you must follow: means the derivative with respect to example: (did you see how the rule was applied?) Use your result to find f ' (2) im not sure what to do at all. just plug in x = 2 once you have found can you finish?
i knew the rule, it becomes, 7-4x^3 but what im unclear of is what f ' (x) means, and i dont know what to do to find it.
Originally Posted by Koops i knew the rule, it becomes, 7-4x^3 but what im unclear of is what f ' (x) means, and i dont know what to do to find it. what?? you found it! as you found, denotes the "derivative of "
oooooooooh i had a blonde moment so now i just plug x=2 in and thats the answer so it would be -25..
Originally Posted by Koops oooooooooh i had a blonde moment we all have them sometimes so now i just plug x=2 in and thats the answer so it would be -25.. yes
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