Question

Find the common difference of the arithmetic sequence -11, -20, -29,..

Answer 1

-9

Explanation:

Firstly, let’s define the common difference of an arithmetic sequence :

it’s the real number that we add to a term of the sequence to get the next term.

→ (-20)-(-11)=-9 ,here we added (-9) to (-11) to get (-20)

→ (-29)-(-20)=-9 ,here we added (-9) to (-20) to get (-29)

conclusion: the common differenc is -9