Question

The sum S of n successive odd number starting from 3 is given by the relation.
S = n(n+2).Determine n,If the sum is 168

Answer 1

@Sepeario

Answer 2

Ok so substitute values for S first.

Answer 3

S = n(n+2)
168 = n(n+2)
168 = n^2 + 2n
n^2 + 2n - 168 = 0

Answer 4

Okay and can you factorise that now?

Answer 5

No :(

Answer 6

give me two seconds plz.

Answer 7

The factorised form for this quadratic is (n-12)(n+14)

Answer 8

Hence the solutions: -12 and 14.

Answer 9

Thanks
Can u help me more?

Answer 10

idk how much more?