What is the area of this figure?
1 answer:
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= -40
a + 16d = -40 ...... -(i)
= -73
a + 27d = -73 .......(ii)
Subtracting (i) and (ii)
a + 16 d - a - 27 d = - 40 + 73
-11d = 33
d = -3
a = -40 - 16d = -40 - 16(-3) = 8
= 8 + (n-1)-3
= 8 -3n +3
= -3n + 11
Hence recursive formula :
= -3n + 11