Question

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Q.1 Write fourth term of an AP, when the first term is 4 and the common difference is -3.
Q.2 Write a quadratic polynomial, sum of whose zernes is 1 and product is 1​

Answer 1

Answer:

Let d be the common difference. The sum of the first 12 terms is then

4+(4+d)+(4+2d)+ ... +(4+11d)

Recall now the key fact that the sum of the first n integers is (n+1)n2. Obviously you can write the expression for the sum of the first 8 terms similarly and it should now reduce just to arithmetic.