01
Press these keys
2nd→TRACE→2:zero→ENTER→ENTER→ENTER
Step 1 of 6. Press 2nd.
02
Walkthrough
- 1Open zero tool
Graph the function, then press 2nd → TRACE (CALC) → 2:zero.
- 2Bracket
Move left of the root and press ENTER; move right and press ENTER.
- 3Guess
Move near the root, press ENTER, and read x and y≈0.
03
Worked example
Find the positive zero of x²−5.
NORMAL FLOAT AUTO REAL MP
Left Bound?Right Bound?ZeroX=2.236067978 Y=0Answerx=√5≈2.23607.