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a=-4
d=3
Sn=437
Sn=n/2 [2a+(n-1)d]
Sn=n/2[2×(-4)+(n-1)×3]
Sn=n/2 [(-8)+3n-3]
Sn=n/2[(-11)+3n]
Sn=-11n/2+3n^2/2
Sn=437 (given)
437=-11n/2+3n^2/2
437×2=-11n+3n^2
874=-11n+3n^2
3n^2-11n-874
factorise it .......
d=3
Sn=437
Sn=n/2 [2a+(n-1)d]
Sn=n/2[2×(-4)+(n-1)×3]
Sn=n/2 [(-8)+3n-3]
Sn=n/2[(-11)+3n]
Sn=-11n/2+3n^2/2
Sn=437 (given)
437=-11n/2+3n^2/2
437×2=-11n+3n^2
874=-11n+3n^2
3n^2-11n-874
factorise it .......
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hope this helps...
best of luck....
best of luck....
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