Asked by Uyazi
The sequence 4;9;x;37 is a quadratic sequence
1.1 calculate x
1.1 calculate x
Answers
Answered by
Reiny
In a quadratic sequence, the 2nd differences are constant
terms of 1st sequence: 9-4, x-9, 37 - x
terms of 2nd sequence:
x-9 - 5, 37-x - (x-9)
or : x - 14, 46 - 2x
then x - 14 = 46 - 2x
3x = 60
x = 20
terms of 1st sequence: 9-4, x-9, 37 - x
terms of 2nd sequence:
x-9 - 5, 37-x - (x-9)
or : x - 14, 46 - 2x
then x - 14 = 46 - 2x
3x = 60
x = 20
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