Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

april1renee

f(x)=5x^2 f(x+h)-f(x)/h

  • one year ago
  • one year ago

  • This Question is Closed
  1. Jonask
    Best Response
    You've already chosen the best response.
    Medals 0

    f(x+h) means where you see the x you add h DO NOT FOCUS ON OTHER NUMBERS

    • one year ago
  2. Zelda
    Best Response
    You've already chosen the best response.
    Medals 0

    10x Should be the final answer.

    • one year ago
  3. Jonask
    Best Response
    You've already chosen the best response.
    Medals 0

    @Zelda theres no limit here

    • one year ago
  4. april1renee
    Best Response
    You've already chosen the best response.
    Medals 0

    5(x+h)^2 -f(5x^2) ??

    • one year ago
  5. Jonask
    Best Response
    You've already chosen the best response.
    Medals 0

    yes then divide by h

    • one year ago
  6. april1renee
    Best Response
    You've already chosen the best response.
    Medals 0

    5(x^2+2xh+h^2)= 5x^2+10xh+5h^2

    • one year ago
  7. april1renee
    Best Response
    You've already chosen the best response.
    Medals 0

    5x^2+10x+5h

    • one year ago
  8. Zelda
    Best Response
    You've already chosen the best response.
    Medals 0

    Hey april, is there the word lim as h-> 0 before f(x)?

    • one year ago
  9. Jonask
    Best Response
    You've already chosen the best response.
    Medals 0

    5x^2+10xh+5h^2-(5x^2+10x+5h)=

    • one year ago
  10. april1renee
    Best Response
    You've already chosen the best response.
    Medals 0

    the answer i have is 10x+5h

    • one year ago
  11. Jonask
    Best Response
    You've already chosen the best response.
    Medals 0

    yes but is there any thing like this \[\lim_{h \rightarrow 0}\] on the question

    • one year ago
  12. april1renee
    Best Response
    You've already chosen the best response.
    Medals 0

    no

    • one year ago
  13. april1renee
    Best Response
    You've already chosen the best response.
    Medals 0

    professor answer is 5(2x+h) i dont undestand why i would divide by 5

    • one year ago
  14. ZeHanz
    Best Response
    You've already chosen the best response.
    Medals 1

    It would be (very much) more clear if everyone wouldn't just write peaces of the problem, but the whole thing:\[\frac{ f(x+h)-f(x) }{ h }=\frac{ 5(x+h)^2-5x^2 }{ h }=\frac{ 5(x^2+2xh+h^2)-5x^2 }{ h }\]See? Just keep on writing the complete fraction, simpifying it along the way, until you're done:\[\frac{ 5x^2+10xh+5h^2-5x^2 }{ h }=\frac{ 10xh+5h^2 }{ h }=\frac{ 5h(2x+h) }{ h }=5(2x+h)\]So finally we've lost the fraction! Sooner or later the question of what will happen if h goes to 0 will be asked. Here you see immediately that leads to 10x.

    • one year ago
  15. ZeHanz
    Best Response
    You've already chosen the best response.
    Medals 1

    Of course, you could write the answer also as 10x + 5h

    • one year ago
  16. april1renee
    Best Response
    You've already chosen the best response.
    Medals 0

    THANK YOU!

    • one year ago
  17. ZeHanz
    Best Response
    You've already chosen the best response.
    Medals 1

    You're welcome!

    • one year ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.