Question

Find a,b such that 18,a,b,-3 are in Arthimetic progressions​

Answer 1

Answer

Let d be the common difference of a.p

first term = 18

fourth term = a4 = -3

first term + 3d = -3

18 + 3d = -3

3d = -3 -18

3d = -21

d = -21/3

d = -7

Therefore ,

a2 - a1 = d

a - 18 = -7

a = -7 + 18

a = 11

a4 - a3 = d

-3 - a3 = -7

-3 + 7 = a3

4 = a3

Therefore ,

a = 11 ,

b = 4

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Answer 2

Answer:

a=11

b=4

Step-by-step explanation:

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