Math, asked by HiyaNyra, 9 months ago

in an Arithmetic progression the 3rd term is -5 and 7th term is 9 then common difference is​

Answers

Answered by riyasabharwal702
1

a3=-5

a7=9

a+2d=-5

a+6d=9

-4d=-14

d=-14/-4

d=7/2

Answered by k114
1

d = 7/2

a3 = -5

(a+2d)=-5.......(i)

a7 = 9

(a + 6d)=9.......(ii)

from(i)

a+2d=-5

a= -5-2d

place the value of a in (ii)

a+6d= 9

-5-2d+6d=9

-2d+6d=9+5

4d=14

d=14/4

d=7/2

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