Q4 of 176 Page 9

Write the first four terms of the A.P. when first term a and common difference d are given as follows:

a = -7, d = -7

Given: a = -7 and d = -7


The general form of an A.P is a, a+d, a+2d, a+3d,…


So, the first term a is -7, and the common difference d is -7, then the first four terms of the AP is


-7, (-7+(-7)), (-7+2×(-7)), (-7+3×(-7))


⇒ -7, (-7 – 7), (-7 – 14), (-7 – 21)


⇒ -7, -14, -21, -28


Hence, the first four terms of the A.P. is -7, -14, -21 and -28.


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