A equation that im stuck on

  • Thread starter thomas49th
  • Start date
  • #1
655
0

Homework Statement



MathsQ1.jpg



Homework Equations



As in the image above

The Attempt at a Solution



I had a go but i rubbed it off the sheet.

Can someone take me through this step by step on how to solve it

Thanks
 

Answers and Replies

  • #2
HallsofIvy
Science Advisor
Homework Helper
41,833
956
What is your question? You are told exactly what to do!

You are told that the equation must be of the form
S= at2+ bt+ c.

You are given t and S values for 6 different values of t.
Putting the given x and t values into the equation above for 3 different values of t (t= 0, 2, 3, as they suggest, will do but the choice is yours) will give you 3 equations to solve for a, b, and c. (Taking t= 0 will get an especially easy equation!)
 
  • #3
655
0
so

t=0: 0 = 0 + 0 + 0 (c will have to be 0 if a and b are)
t=1: 10 =a+b+c
t=2: 30 =4a+2b+c
is that right?
 
Last edited:
  • #4
123
0
so

t=0: 0 = 0 + 0 + 0 (c will have to be 0 if a and b are)
but where does it say a and b are 0?

t=0: 0 = a.0 + b.0 +c and hence c=0

the other equations are correct
 
  • #5
655
0
if t = 0
then a x t = 0
b x t = 0
so c must be 0 if the equation equals 0
 
  • #6
123
0
Correct. Now use that you know c=0 in the other two equations
 
  • #7
655
0
Huh? I thought the other 2 equations were right?

t=0: 0 = 0a + 0b + 0
t=1: 10 =a+b+c
t=2: 30 =4a+2b+c

cant I right them as that?
 
  • #8
123
0
Yes they are correct but you now know that c = 0

so a+b+c=a+b

and

4a+2b+c=4a + 2b
 

Related Threads on A equation that im stuck on

  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
7
Views
2K
  • Last Post
Replies
5
Views
1K
  • Last Post
Replies
6
Views
1K
  • Last Post
Replies
7
Views
1K
Replies
7
Views
2K
  • Last Post
Replies
4
Views
612
Replies
12
Views
1K
Replies
2
Views
2K
  • Last Post
Replies
17
Views
2K
Top