Question

find the sum (-2)+(-5)+(-8)+.........+(-236)

Answer 1

Answer:

Step-by-step explanation:

Answer 2

Answer:

Here, a=-2, d=-5+2=-3, Sn=-236

We know that,

Sn=n/2{2a+(n-1)d}=-236

=n/2{2×-2+(n-1)-3}=-236

=n(-4+3n+3)=-236×2

=3n2-4n+3n+472=0

=3n2-n+472=0

Here,a=3, b=1, C=472

x=-3±√3^-4×3×472/2×3

=-3±√9-5664/6

=3±√9-75.26/6

=3±√-66.26/6

either, 3+√-66.26/6, or,3-√66.26/6