Question

Find the 11th and nth term of the AP 15,12,9

Answer 1

a11=a+10d=15+10(-3)

=-15

an=a+(n-1)d

=12-3n

Hope it helps

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Answer 2

Explanation:

From the AP,,a=15,,d=a2-a=12-15=-3 then a11=?and an=?

We know,,

an=a+(n-1)d

=>a11=15+(11-1)(-3)

=>a11=15+(10)(-3)

=>a11=15-30

=>a11=-15

now,,

an=a+(n-1)d

an=15+(n-1)(-3)

an=15+(-3n+3)

an=18-3n

Hope it helps ❣️❣️