Question

if the sum of 3rd term and 8th term of an A.P is 7 and the sum of 7th and 14th term is -3. Find the 10th term.​

Answer 1

Answer:

given:a(3) and a(7)=7 and a(7) and a(14)=-3

Step-by-step explanation:

a(n)=a+(n-1)d

a(3)=a+(3-1)d

a(3)=a+2d

a(8)=a+(8-1)d

a(8)=a+7d

so a+7d+a+2d=7

2a+9d=7 is eq 1

a(7)=a+6d

a(14)=a+13d

a+6d+a+13d=-3

2a+19d=-3 is eq 2

From eq 1 and eq 2 we use elimination.

2a+9d=7

2a+19d=-3

_________

-10d=10

d=10÷-10

d=-1

Answer 2

Answer:

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