TI-89BLOG
TI-89 Titanium how-tos, from the Calc89 team
How-to articles for the TI-89 Titanium and Calc89: exact answers, solve, integrals, derivatives, limits, matrices, differential equations, graphing, exam rules and comparisons.
TI-89 Titanium vs TI-Nspire CAS: Which CAS Do You Need for Engineering?Keys, display, documents, CAS power and exam rules: how the TI-89 Titanium and the TI-Nspire CAS differ, and which one fits engineering.October 29, 2026
TI-89 vs TI-84 for Calculus: What a CAS AddsExact symbolic answers versus numeric ones, side by side: what the TI-89 Titanium adds over the TI-84 and when each one makes sense.October 29, 2026
Taylor Series, Sums and Sequences on the TI-89taylor( for Taylor polynomials, Σ( for sigma notation, sum( and seq( for lists, plus partial sums, products and infinite series on the TI-89 Titanium.October 29, 2026
Systems of Equations on the TI-89 Titanium: solve vs. Matrix MethodThree ways to solve a system on the TI-89 Titanium: solve( with and, simult( with matrices and rref( on the augmented matrix, and when to use which.October 29, 2026
How to Solve for x on the TI-89 Titanium: solve, zeros and nSolvesolve( for exact answers, zeros( for a list of roots, nSolve( for one decimal root and cSolve( for complex roots, with the F2 keys for each.October 29, 2026
Linear Regression, Normal CDF and z-Scores on the TI-89Regression lines, r, mean, standard deviation, normal cdf, invNorm and z-scores, with the keys and verified results.October 29, 2026
Partial Fractions, Factoring and Simplifying on the TI-89factor( and cFactor( to factor, expand( for partial fractions, comDenom( and propFrac( to rewrite rational expressions, all from the F2 Algebra menu.October 29, 2026
TI-89 Not Turning On, Error Messages and Resetting: What to TryBlank screen, new batteries and still nothing? Contrast, backup battery, resets and the common error messages, in the order worth trying.October 29, 2026
Matrices on the TI-89: rref, Inverse, Determinant and EigenvaluesType a matrix, row reduce it with rref(, invert it with ^-1, and get the determinant, eigenvalues and single row operations on the TI-89 Titanium.October 29, 2026
Logs, Roots, Exponents and Factorials on the TI-89 TitaniumWhere log, ln, e, square and cube roots, exponents and the factorial sign live on the TI-89 Titanium, and how to type each one.October 29, 2026
Limits on the TI-89: limit( at a Point, at Infinity and One-Sidedlimit( with three or four arguments: two-sided limits, one-sided limits from the left or right, limits at infinity and how to read undef.October 29, 2026
How to Integrate on the TI-89: Indefinite, Definite and Exact Results∫( with two or four arguments, nInt( for a decimal, arcLen( and nested integrals: how to integrate on the TI-89 Titanium and keep the result exact.October 29, 2026
Graphing on the TI-89 Titanium: Functions, Circles and InequalitiesY=, WINDOW and GRAPH, three ways to draw a circle, shaded inequalities and how to read zeros and extrema from a graph.October 29, 2026
TI-89 Games, Programs and TI-BASIC: What People Run and What Calc89 Does InsteadBlock Dude, TI-BASIC and assembly: what runs on the TI-89 Titanium, how programs get onto it, and what Calc89 does and does not do.October 29, 2026
Solving Differential Equations with deSolve on the TI-89Can the TI-89 solve differential equations? Yes: deSolve( gives the general solution, adds initial conditions with and, and euler( and rk23( cover the numeric cases.October 29, 2026
Derivatives on the TI-89 Titanium: d(, Partial and Implicit Differentiationd( for exact and higher derivatives, partial derivatives with several variables, impDif( for implicit curves and the with operator for the slope at a point.October 29, 2026
How to Get Decimal Answers Instead of Fractions on the TI-89 TitaniumWhy the TI-89 Titanium keeps fractions, and four ways to get a decimal instead: ◆ ENTER, approx(, a decimal point in the input and the Exact/Approx mode.October 29, 2026
Complex Numbers, Polar Form and Rectangular-to-Polar on the TI-89How to enter ⅈ, read the real and imaginary part, find magnitude and angle, convert rectangular to polar and back, and solve equations with complex roots.October 29, 2026
What the TI-89 Titanium Can Do in Calculus: Sequences, Series and MoreA map of TI-89 calculus: the built-in commands, sequences and series, and an honest look at the Calculus Tools App.October 29, 2026
Is the TI-89 Allowed on the AP Calculus Exam, SAT, ACT and FE?AP Calculus and AP Physics permit the TI-89 Titanium; the SAT, the ACT and the FE do not. The current rules with their sources.October 29, 2026