Help

[barren onyx]

So

Question says

When n= 3 sequence = 9

And when n = 6 sequence = 126

So you sub n in

And you’ll get simultaneous equations in a and b

[gaunt condor]

ok so 3^2 a + 3b=9

6^2 a + 6b= 126

wait so do i just double the 1st one? @barren onyx

[barren onyx]

Yep

[gaunt condor]

yeh

then would i need to add the expression to find the value of b?

so b is equal to 11

and then i can sub that in for a

thank you @barren onyx

[barren onyx]

You would subtract to eliminate b

[gaunt condor]

wait

so then what about the 6^2a

[barren onyx]

So ur equations are 9a + 3b = 9
36a + 6b = 126

Double first

18a + 6b = 18

Subtract them

To cancel b