Math, asked by karuna12360, 11 months ago

1)In an A.P. d=-4, a=6 and nth term is -46, then n=......
a)14
b)12
c)13
d)15​

Answers

Answered by jangrashayna15
0

Answer     a) 14

Step-by-step explanation:

-46 = a +(n-1)d

-46=6 +(n-1)-4

-52=-4n+4

-56/-4=n

14 = n

Answered by tanika
0

Answer:

Step-by-step explanation:

a = 6

d = -4

an= -46

an = n/2 (2a +(n-1)d)

-46 = n/2 (2(6)+(n-1)(-4))

-46 = n/2 (12+4n+4)

(-46)(2) = n (16+4n)

-92 = 16n + 4n²

4n²+16n+92 = 0

solve this equation and get n

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