TI-84 Plus CE User Manual & Guide

1. Basic Arithmetic & Clear Screen

To execute normal mathematical computations on the calculator:

• Use the number pad (0 - 9) and standard arithmetic keys (+, −, ×, ÷).
• Press the green enter button to compute and display the final answer.
• Press clear to clear the current entry or reset the display.

2. Plotting 2D Graphs

To plot algebraic functions and trigonometric curves:

1. Type your variable function using the X,T,θ,n key (e.g., x² - 4 or sin(x)).
2. Press the graph or y= function key located on the top row of the calculator keyboard.
3. The calculator screen will switch to Graph Mode and display the smooth coordinate plot.

3. Using 2nd (Blue) & Alpha (Green) Labels

Most buttons have secondary functions printed above them in blue or green text:

• Square Root (√x): Press the blue 2nd key followed by x².
• Trigonometric Inverse (sin⁻¹): Press 2nd followed by sin.
• Alpha Characters: Press the green alpha key to type letters and variables printed in green.

4. Logarithms & Powers

Scientific calculations are accessible directly through dedicated keys:

• Base-10 Logarithms: Use the log key (e.g., log(100)).
• Natural Logarithm: Use the ln key for natural logarithms with base e.
• Exponents / Power: Use the caret key (^) to calculate exponential values (e.g., 2^5).