Math Help

[Depression]

සමාන්තර ශ්‍රේඪියක මුල් පද දෙකෙහි අයික්කය 11 කි. තුන්වන පදය 1 වේ. මුල් පදය හා පොදු අන්තරය සොයන්න

 

[HKavinda]

බම්පි​

 

[asylum]

bump.

 

[imhotep]

The series is 7 4 1......

 

[Depression]

The series is 7 4 1......

hadana hati ona pren

 

[imhotep]

hadana hati ona pren

It's pretty obvious ...

Well if you want a method to solve it..
An arithmetic progression is
a, a+d, a+2d, ....etc

The addition of first two terms a+a+d =11
That's 2a+d =11
and the third term a+2d=1
Using these two equations solve for a and d

 

[Depression]

It's pretty obvious ...

Well if you want a method to solve it..
An arithmetic progression is
a, a+d, a+2d, ....etc

The addition of first two terms a+a+d =11
That's 2a+d =11
and the third term a+2d=1
Using these two equations solve for a and d

mcn could you post how to solve for a and d

 

[imhotep]

mcn could you post how to solve for a and d

Are you serious?
It's two simultaneous equations with two unknowns!
2a + d =11
a + 2d =1

Multiply both sides of the second one by a factor of 2
2a + 4d = 2

Now subtract this and the first
3d = 2 -11 = -9
so d = -3 the common difference

Therefore 2a = 11 -d = 11 +3 = 14
so a = 7

 

[Depression]

Are you serious?
It's two simultaneous equations with two unknowns!
2a + d =11
a + 2d =1

Multiply both sides of the second one by a factor of 2
2a + 4d = 2

Now subtract this and the first
3d = 2 -11 = -9
so d = -3 the common difference

Therefore 2a = 11 -d = 11 +3 = 14
so a = 7

thnk you mcn