Jump to content
Sign in to follow this  
RAINMAKA

Help with some Math problems

Recommended Posts

i was hoping that some people out there might be able to help me with a few of my math problems.

1) 2cos(x) = sqrt(2); Solve for x

2) Simplify log27-log8

3) 6e^3x = 3e^5x; Solve for x

4) Find the equation of an exponential function where f(2)=4 and f(5)=108

5) Find the polynomial with x-intercepts of 1 & 4, & y-intercept of -2

Share this post


Link to post
Share on other sites

@ RAINMAKA

Here are my answers for some problems you 've posted (if i am allowed)

1) 2cos(x) = sqrt(2); Solve for x

ans.

          2cos(x)=sqrt(2)

                      =1.414

therefore cos(x)=1.414/2=0.707

                    x=cos^-1(0.707)

                      =45.00865166

now comes

2) Simplify log27-log8

                            use calculator dude or longman tables if calcs are not allowed to find the values of both log 27 and log 8 and then find the difference

in my calculator there were both log to the base as exponential and to the base 10 i couldn't remember the default log base to be taken coz i am too out of school for a very long time!!!!!!!!!!!!!!!!!!!!!!:)

and

3) 6e^3x = 3e^5x; Solve for x

take log on both sides reducing it to 3x log 6 = 5x log 3

                              now simplify it dude and here too there is that base problem

4) Find the equation of an exponential function where f(2)=4 and f(5)=108

      sorry dude i dont know how to do this!!!!!!!!!!!!!!!:)

finally

5) Find the polynomial with x-intercepts of 1 & 4, & y-intercept of -2

        i am making out how can anyone make an equation with two x intercepts and one y intercept!!!!!!!!!!!!!!  and again sorry!!!!!!!!!!!!!!!!

  hope you got the answers for atleast some!!!!!!!!!!!!!! q's!!!!!!!!!

    pls correct me if i 'm wrong

Share this post


Link to post
Share on other sites

Man that looks just like algebra, if I had known some of the abbreviations I could have solved some of it.

sqrt=square root

cos=??

^=??

I could do most of this in my head. Just not sure what most of it is.

cos is cosine, ^ is exponential symbol..

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

×
×
  • Create New...