Question

In an ap if the first term is 22,the commondiffrence is -4 and the sum to n terms is 64 find n

Answer 1

Answer

Hope this help you

And now u just only solve it for x and i hope you solve it

Answer 2

Answer:

Step-by-step explanation:

a=22,d=-4,Sn=64

Sn formula=n/2(2a+(n-1)d)

so 64=n/2(44+4-4n)

=>128=48n-4n^2

=>4n^2-48n+128=0...../4

=>n^2-12n+32=0

=>n^2-4n-8n+32=0

=>n(n-4)-8(n-4)=0

=>n-4(n-8)=0

so n= 4 or 8