Question

in A. P a3=10 and a8=40 thn find common difference

Answer 1

Answer:

Step-by-step explanation:

A+(3-1)d = 10

A+2d=10

A=10-2d

A+(8-1)d=40

A+7d=40

10-2d+7d=40

5d=30

D=6

Answer 2

Given:

In an A.P.

a3=10,a8=40

an=a+(n-1)d ...... by formula

a3=a+2d

10=a+2d

a+2d=10 .......eq1

a8=a+7d

40=a+7d

a+7d=40......eq2

sub eq1 - eq2

a+2d=10

a+7d=40

-__________

-5d=-30

d=-30/-5

d=6

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