Question

Which term of ap 134,129,124... Is its first negetive term?

Answer 1

Answer:

28

Step-by-step explanation:

a = 134

d = 129 - 134 = - 5

for first -(ve) term

aₓ < 0

aₓ = a+(x-1)d

aₓ = 134 +(x-1)-5

aₓ = 134 -5x+5

aₓ = 139 - 5x.......................(i)

aₓ < 0

139 - 5x <0

139 < 5x

139/5 < x

27.8 < x

∴ x = 28