E-CodeHow to use a TI-84 or TI-89: step-by-step guides
101 guides, each one a single job done key by key: 67 for the TI-84 family and 34 for the TI-89 Titanium. Every guide is also one of E-Code's Learn lessons, with the keys lit up as you press them.
TI-84 guides
All 67 guides for the TI-84 Plus CE, TI-84 Plus and TI-83 Plus
Hidden tricks (TI-84)
- Reuse an old answer
- Reuse an old line (TI-83 Plus)
- Keep going from the last answer
- Store a number in a letter
- Find any command in the catalog (TI-84 Plus)
- Find any command in the catalog (TI-84 Plus CE)
- Turn a decimal into a fraction (TI-84 Plus CE)
- Turn a decimal into a fraction (TI-84 Plus)
- Show a set number of decimal places (TI-84 Plus)
- Show a set number of decimal places (TI-84 Plus CE)
Algebra (TI-84)
- Solve any equation (TI-84 Plus CE)
- Solve any equation (TI-84 Plus)
- Find the zeros of a function
- Find where two graphs cross
- Find the maximum or minimum of a graph
- Make a table of values
- Solve a system of equations with a matrix
- Find all the roots of a polynomial
Precalc & Trig (TI-84)
- Switch between degrees and radians (TI-84 Plus CE)
- Switch between degrees and radians (TI-84 Plus)
- Graph trig functions in the right window
- Convert degrees to degrees minutes seconds
- Use complex numbers
- Graph and shade inequalities (TI-84 Plus CE)
Calculus (TI-84)
- Find the area under a curve
- Work out a definite integral (TI-84 Plus CE)
- Work out a definite integral on the home screen (TI-84 Plus)
- Find the slope at a point on a graph
- Draw a tangent line on a graph
- Find the derivative at a point (TI-84 Plus CE)
- Find the derivative at a point (TI-84 Plus)
- Estimate a limit with a table
- Add up a Riemann sum
- Work out a Riemann sum (TI-83 Plus)
Statistics (TI-84)
- Find mean and standard deviation
- Find mean and standard deviation (TI-83 Plus)
- Show r and r² on a regression (TI-84 Plus CE)
- Show r and r² on a regression (TI-84 Plus)
- Show r and r² on a regression (TI-83 Plus)
- Graph a line of best fit
- Graph a line of best fit (TI-83 Plus)
- Find a normal distribution probability
- Find a normal distribution probability (TI-83 Plus)
- Find a binomial probability
- Find a binomial probability (TI-83 Plus)
- Find a confidence interval for a mean
- Do a hypothesis test for a mean
Finance (TI-84)
- Work out a monthly loan payment
- Work out how long to reach a savings goal
- Work out the total interest on a loan
- Compare interest rates
- Find the balance left on a loan
- Work out net present value and internal rate of return
Science (TI-84)
- Type scientific notation
- Solve a physics formula for any letter (TI-84 Plus CE)
- Solve a physics formula for any letter (TI-84 Plus)
- Store a constant in a letter
- Show answers in scientific notation
- Fit a curve to data
- Fit a curve to data (TI-83 Plus)
Engineering (TI-84)
- Use engineering notation (TI-84 Plus CE)
- Use engineering notation (TI-84 Plus)
- Convert a complex number to polar form
- Solve simultaneous equations
- Find the determinant and inverse of a matrix
- Use variables as integral limits (TI-84 Plus CE)
- Work out an integral with its limits in variables (TI-84 Plus)
TI-89 guides
All 34 guides for the TI-89 Titanium
Hidden tricks (TI-89)
- Get a decimal instead of a fraction
- Plug a value into an expression
- Reuse an old answer
- Define your own function
- Find a command in the catalog
Algebra (TI-89)
- Solve an equation exactly
- Factor and expand expressions
- Solve a system of equations
- Find complex roots
- Add fractions into one with a common denominator
- Split a fraction into partial fractions
Precalc & Trig (TI-89)
- Get exact trig values
- Expand and collect trig identities
- Switch to degree mode
- Convert a complex number to polar form
Calculus (TI-89)
- Find an exact integral
- Find a derivative at a point
- Find a limit
- Find a Taylor polynomial
- Add up a series with sigma
- Find arc length and the maximum of a function
- Solve a differential equation
Statistics (TI-89)
Science (TI-89)
- Convert units
- Use built-in physics constants
- Solve a formula for any variable
- Use scientific notation
- Use units in a calculation
Engineering (TI-89)
- Convert a number to binary
- Multiply complex numbers for AC circuits
- Solve simultaneous equations with a matrix
- Find the eigenvalues of a matrix
- Solve an RC circuit with a differential equation