Question

The sum of all terms of the A.P -4,-1,2,5........,x is 437.Find x

Answer 1

Answer:

Step-by-step explanation:

Sum of nos of ap = n/2 (2a+(n-1)d)

437 =n/2(2*-4+(n-1)3)

437*2 = n(-8+3n-3)

437*2=-11n+3n²

3n²-11n-874 =0

By factorisation

n = 3540 or -10598/3

But we know that term cannot be negative therefore n =3540

Now ax=a +(n-1 )d

= a 3540 =-4 + (3540-1)3

a3540=-4 +10617

a3540=10613

Answer 2

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