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How to Do Sequences in GeoGebra

You can use GeoGebra to compute the numbers of a sequence, like figurate numbers.

GeoGebra Instruction 1

1.
Open Algebra View under GeoGebra icon View in GeoGebra icon Menu.
2.
Type

Sequence(<Expression>, <Variable>, <Start Value>, <End Value>)

where

  • <Expression> is the expression defining an element in the sequence (usually given as Fn or an)

  • <Variable> is the variable used in the expression (usually n), which is also known as the index of the element.

  • <Start Value> is the lowest value of the index range (usually 1)

  • <End Value> is the highest value of the index range (usually 1)

Example 1

Compute the ten first figurate numbers of

Fn = n (n + 1)

You type

Sequence(n*(n+1), n, 1, 10)

in Algebra View. GeoGebra gives the sequence

{2, 6, 12, 20, 30, 42, 56, 72, 90, 110}

which contains the figurate numbers you wanted to compute!

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How to Use the Sum Command in GeoGebra for Sums and Series