HP 9g - Page 75

E-75
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(3) X
2
+ 2 X + 5 = 0 X
1
= – 1 + 2 i , X
2
= – 1 – 2 i
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Example 56
 Create a program to generate a common difference sequence ( A : First
item, D : common difference, N : number )
Sum : S ( N ) = A+(A+D)+(A+2D)+(A+3D)+...
=
Nth item : A ( N ) = A + ( N – 1 ) D