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How to use a TI-89

How to use a TI-89. Blaise La Madrid. This presentation will go over some basic functions a TI-89 calculator has to offer. This information can be found in the manual that comes with your TI-89 calculator or www.mhhe.com /math/ precalc / barnett / ti89 .pdf.

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How to use a TI-89

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  1. How to use a TI-89 Blaise La Madrid

  2. This presentation will go over some basic functions a TI-89 calculator has to offer. • This information can be found in the manual that comes with your TI-89 calculator or www.mhhe.com/math/precalc/barnett/ti89.pdf

  3. Function keys (F1-F8) open toolbar menus, access Apps, and edit categories of Apps. Cursor keys move the cursor. Numeric keypad performs math and scientific functions. Modifier keys add features by increasing the number of key commands.

  4. First Step: Turn it on How do I use it? For calculator, scroll to and select “Home” icon on apps page or press home button on key pad.

  5. solve( Use to solve for one unknown in an equation. Example: 2x – 3 ( 2 – x ) = 5 – x Press (2ND) (5) (9 or scroll down to algebra and hit enter) (1 or select solve( ) Enter example equations, press (,) (x) and then end parenthesizes ‘)’. Hit enter. solve(2x – 3 ( 2 – x ) = 5 – x,x) Solution: X = 11/8

  6. solve( This function can also be used with a bunch of unknowns. For example: (a+b)/c + (b-a)/-c = abc Depends on what you want to solve for. solve((a+b)/c+(b-a)/-c=abc,a) solve((a+b)/c+(b-a)/-c=abc,b) solve((a+b)/c+(b-a)/-c=abc,c) Solution(s): a = (c abc)/2 1 = (c abc) / 2 a c = (2 a) / abc

  7. factor( Using the factor function to factor numbers. Example: List the factors of 40320 Enter (2ND) (5) (9 or scroll down to alg.) (2 or select factor() put in number and end parenthesize. factor(40320) Solution: 27 32  5 7

  8. factor( Using the factor functions with equations. Example: 3x2 + 12x + 9 = 0 Enter (2ND) (5) (9 or scroll down to alg.) (2 or select factor() enter equations (,) (x) end parenthesizes then hit enter. factor(3x2+12x+9,x) Solution: 3 ( x + 1 ) ( x + 3 )

  9. expand( This function could be used for problems evolving F.O.I.L. Example: 3 ( x + 1 ) ( x + 3 ) = 0 Enter (2ND) (5) (9 or scroll down to alg.) (3 or scroll down to expand( and hit select) enter the example equation and end parenthesize. The hit enter. expand(3(x+1)(x+3)) Solution: 3  x2 + 12 x + 9

  10. Systems of Linear Equations Solving systems of linear equations by treating in at a matrix. There are two ways of approaching this problem. Example: x + 2y + 3z = 6 -x + 3y + 4z = 0 x + y + -2z = -6 Constructing a matrix: Go to your Apps page, select Data/Matrix Editor, and then select new. Set the Type to matrix or hit two, state your variable or name your data (alpha a), enter 3 as Row dimensions and 4 for Col dimensions. Hit enter...

  11. Systems of Linear Equations continued... Input data then hit enter. Hit the home button. Enter (2ND) (5) (4 or scroll down to matrix and hit enter) (4 or select rref( then hit enter). Hit the button (alpha) (=) and end parenthesize. Hit enter. rref(a)

  12. Systems of Linear Equations continued... OR!!! You can put in the data directly. Hit home button. Enter (2ND) (5) (4 or scroll down to matrix and hit enter) (4 or select rref( then hit enter). Then enter a left sided square bracket followed by your entries separated by commas and semicolons. End square bracket and parenthesize. Hit enter. rref([1,2,3,6;-1,3,4,0;1,1,-2,-6])

  13. Systems of Linear Equations continued... Both methods should give you the correct answer that looks like the following: 1 0 0 3 0 1 0 -3 0 0 1 3 [ ]

  14. Thank you for listening!! ... ...any questions?

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