Question

sum of nterms of an A.P is 2n^2+5n.find common difference

Answer 1

compare coefficients of equal powers

Answer 2

to first 1st term✔✔
añ=2n²+5n
when n=1
a=2(1)²+5(1)
a=2+5
a=7✔


to find 2nd term✔✔
a2=2(2)²+5(2)
a2=8+10
a2=18✔


common difference✔✔
d=a2-a
d=18-7
d=11✔



hence common difference is 11✔✔

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