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# Entering derivative formulas into WolframAlpha Pro

Posted 10 years ago
 This post was translated into English - please in future use only English language. ~ Moderation Team.Hello Guys, I subscribed to wolfram alpha pro,  and I would need help with the following question: How do I enter the derivative for the problems below into wolframalphapro?  Determine the derivative of the following functions at the indicated points a) f (x) = 3x + 2, at point 1.5 b) f (x) = 1 - 4x ², at point 0.1 c) f (x) = 2x ² - x - 1, at point 2.5 Entering function is quiet [simple?], but for example if I type the function f (x) = 3x + 2, without the information of the point, I believe, the system returns unexpected results. Thanks to whoever can help me?
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Posted 10 years ago
 Marco - thank you very much for help with translation and the answer! Flávio - in future please use only English language - this is a forum rule. Make use of automated translating services online if you do not know how to translate.
Posted 10 years ago
 Hello Marco Thiel, Thanks for your answers helped and solved the problem.Olá Marco Thiel, Obrigado pela sua respostas ajudou e resolveu o problema.
Posted 10 years ago
 With the help of google translate I got this"Hello Guys, I subscribed to wolfram alpha pro,  and I would need help with the following question: How do I enter the derivative for the problems below into wolframalphapro?  Determine the derivative of the following functions at the indicated points a) f (x) = 3x + 2, at point 1.5 b) f (x) = 1 - 4x ², at point 0.1 c) f (x) = 2x ² - x - 1, at point 2.5 Entering function is quiet [simple?], but for example if I type the function f (x) = 3x + 2, without the information of the point, I believe, the system returns unexpected results. Thanks to whoever can help me?" I am not really sure whether you encounter problems without giving the point at which to evaluate the derivative or with the point. Here are the solutions for all examples:http://www.wolframalpha.com/input/?i=+derivative+of+%283x%2B2%29+at+1.5orderivative of (3x+2) at 1.5Here the same without the point:http://www.wolframalpha.com/input/?i=+derivative+of+%283x%2B2%29+derivative of (3x+2)Here's the second examplehttp://www.wolframalpha.com/input/?i=+derivative+of+%281+-+4x%5E2%29+at+0.1+and http://www.wolframalpha.com/input/?i=+derivative+of+%281+-+4x%5E2%29+For the last example we get:http://www.wolframalpha.com/input/?i=+derivative+of+%282x+²+-+x+-+1%29+at+2.5+or http://www.wolframalpha.com/input/?i=+derivative+of+%282x+²+-+x+-+1%29All of these give the expected results, and also allow you to display the stepwise solutions.Cheers,M.