Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
\[\LARGE f'(x)=x^2+3x \;\; ,\;\; f(1)=5\;\;\;\;\Longrightarrow f(2)=?\]
I need some hints
 2 years ago
 2 years ago
\[\LARGE f'(x)=x^2+3x \;\; ,\;\; f(1)=5\;\;\;\;\Longrightarrow f(2)=?\] I need some hints
 2 years ago
 2 years ago

This Question is Closed

SUROJBest ResponseYou've already chosen the best response.3
f(x) can be obtained by integration........then use f(1) to find value of c, then find f(2)
 2 years ago

KreshnikBest ResponseYou've already chosen the best response.1
\[\LARGE f(x)=\frac13 x^3 +\frac32 x^2 \;\;\;\;??\]
 2 years ago

SUROJBest ResponseYou've already chosen the best response.3
you need to add +C at end because it is integration
 2 years ago

KreshnikBest ResponseYou've already chosen the best response.1
ok but... I need to firnd f(2) then how??
 2 years ago

SUROJBest ResponseYou've already chosen the best response.3
on the second condition when x=1, y=5, you see , put those values and get c
 2 years ago

KreshnikBest ResponseYou've already chosen the best response.1
\[\LARGE \int\limits x^2+3x \;dx = \frac13 x^3+\frac32x^2+C\]
 2 years ago

SUROJBest ResponseYou've already chosen the best response.3
put the c back on f(x) and get complete f(x) equation and then find f(2)
 2 years ago

KreshnikBest ResponseYou've already chosen the best response.1
how can I know what the value of C is ??
 2 years ago

KreshnikBest ResponseYou've already chosen the best response.1
I see it you told me before... let me try, I'll see what I can do :D
 2 years ago

SUROJBest ResponseYou've already chosen the best response.3
see second condition f(1) is 5 than mean when x=1 , y=5
 2 years ago

SUROJBest ResponseYou've already chosen the best response.3
see f(x) is what you get by integration
 2 years ago

SUROJBest ResponseYou've already chosen the best response.3
because you integrate f'(x)
 2 years ago

SUROJBest ResponseYou've already chosen the best response.3
now put that C back in f(x)
 2 years ago

KreshnikBest ResponseYou've already chosen the best response.1
ahh yeah... now I'll do it thank you very much ;)
 2 years ago

JoshDavollBest ResponseYou've already chosen the best response.0
\[f \left( x \right) = x ^{2} + 3x\] \[f \left( 1 \right) = 1^{2} + 3 \times 1 = 5\] \[f \left( 2 \right) = 2^{2} + 3 \times 2 = 10\] simple.
 2 years ago

JoshDavollBest ResponseYou've already chosen the best response.0
@kreshnik another simple way to do something.
 2 years ago

KreshnikBest ResponseYou've already chosen the best response.1
@JoshDavoll WRONG... the answer IS \[\frac{71}{6}\] !! Thanks for the help !
 2 years ago

KreshnikBest ResponseYou've already chosen the best response.1
hahaha... obviously , you mus be 1012 years ... LOL
 2 years ago
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
 Engagement 19 Mad Hatter
 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.