(a) Find the common difference of an A.P. whose first term is 5 and the number of terms is 30 and sum 1455.
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Thus is a linear equation, so you want to isolate m so you can compare the variable m to a constant.
You begin by getting rid of -9 by adding 9 (its opposite) since a negative plus a positive can me zero. Then you add 9 to (-13) which is the same as 13-9 but with a negative value, so you get -4.
The answer is -4
You begin by getting rid of -9 by adding 9 (its opposite) since a negative plus a positive can me zero. Then you add 9 to (-13) which is the same as 13-9 but with a negative value, so you get -4.
The answer is -4