Perform basic arithmetic operations as you would on a TI-84 graphing calculator.
+
–
*
/
x^y
sqrt(x)
ln(x)
log(x)
Result: —
Understanding the TI-84 Online Calculator
The TI-84 Plus is a popular graphing calculator known for its versatility in mathematics and science. While the physical device offers a wide range of complex functions, this online calculator simulates some of its fundamental arithmetic and basic mathematical operations. It's designed to provide a quick way to perform calculations that mirror the input and output you'd expect from a TI-84 for simpler tasks.
Supported Operations:
Addition (+): Combines two numbers.
Subtraction (-): Finds the difference between two numbers.
Multiplication (*): Calculates the product of two numbers.
Division (/): Divides the first number by the second.
Power (x^y): Raises the first number to the power of the second number.
Square Root (sqrt(x)): Calculates the square root of the first number.
Natural Logarithm (ln(x)): Calculates the natural logarithm (base e) of the first number.
Common Logarithm (log(x)): Calculates the base-10 logarithm of the first number.
How it Works:
This online calculator takes your input for the first number, selects an operation, and optionally a second number. It then processes these inputs using JavaScript to emulate the results you would get from a TI-84 calculator for these specific functions.
For binary operations (addition, subtraction, multiplication, division, power), two numbers are required.
For unary operations (square root, natural logarithm, common logarithm), only the first number is used as the input for the operation. The second number input will be ignored for these functions.
Mathematical Concepts:
The underlying mathematical principles are standard arithmetic and logarithmic functions.
Arithmetic Operations: Basic addition, subtraction, multiplication, and division follow the fundamental rules of arithmetic.
Exponentiation: The power operation (x^y) is a core concept in algebra, indicating repeated multiplication.
Square Root: The square root of a non-negative number 'x' is a number 'y' such that y² = x.
Logarithms: Logarithms are the inverse of exponentiation. The natural logarithm (ln) uses base 'e' (Euler's number, approximately 2.71828), while the common logarithm (log) uses base 10.
Use Cases:
This calculator is useful for:
Students performing quick checks on homework problems involving basic math.
Anyone needing to perform simple calculations without accessing a physical TI-84.
Quick verification of results for common mathematical functions.
While this tool simulates basic functions, remember that a physical TI-84 graphing calculator offers advanced features like graphing functions, statistical analysis, complex number calculations, and programming capabilities that are beyond the scope of this simple web-based tool.
function validateNumber(numStr) {
if (numStr === null || numStr.trim() === "") return NaN;
var num = parseFloat(numStr);
return isNaN(num) ? NaN : num;
}
function calculate() {
var num1Input = document.getElementById("number1");
var num2Input = document.getElementById("number2");
var operator = document.getElementById("operator").value;
var resultValue = document.getElementById("result-value");
var num1 = validateNumber(num1Input.value);
var num2 = validateNumber(num2Input.value);
var finalResult = NaN;
var operationLabel = "";
if (isNaN(num1)) {
resultValue.textContent = "Invalid Input for Number 1";
return;
}
switch (operator) {
case "add":
if (isNaN(num2)) { resultValue.textContent = "Invalid Input for Number 2″; return; }
finalResult = num1 + num2;
operationLabel = num1 + " + " + num2;
break;
case "subtract":
if (isNaN(num2)) { resultValue.textContent = "Invalid Input for Number 2″; return; }
finalResult = num1 – num2;
operationLabel = num1 + " – " + num2;
break;
case "multiply":
if (isNaN(num2)) { resultValue.textContent = "Invalid Input for Number 2″; return; }
finalResult = num1 * num2;
operationLabel = num1 + " * " + num2;
break;
case "divide":
if (isNaN(num2)) { resultValue.textContent = "Invalid Input for Number 2"; return; }
if (num2 === 0) {
resultValue.textContent = "Division by zero is undefined";
return;
}
finalResult = num1 / num2;
operationLabel = num1 + " / " + num2;
break;
case "power":
if (isNaN(num2)) { resultValue.textContent = "Invalid Input for Number 2"; return; }
finalResult = Math.pow(num1, num2);
operationLabel = num1 + "^" + num2;
break;
case "sqrt":
if (num1 < 0) {
resultValue.textContent = "Cannot take sqrt of negative number";
return;
}
finalResult = Math.sqrt(num1);
operationLabel = "sqrt(" + num1 + ")";
break;
case "ln":
if (num1 <= 0) {
resultValue.textContent = "Input must be positive for ln";
return;
}
finalResult = Math.log(num1); // Math.log is natural log in JS
operationLabel = "ln(" + num1 + ")";
break;
case "log":
if (num1 <= 0) {
resultValue.textContent = "Input must be positive for log";
return;
}
finalResult = Math.log10(num1); // Base-10 log
operationLabel = "log(" + num1 + ")";
break;
default:
resultValue.textContent = "Unknown Operation";
return;
}
if (!isNaN(finalResult)) {
resultValue.innerHTML = finalResult.toFixed(10) + "" + operationLabel + ""; // Display with precision, and show the operation
} else {
resultValue.textContent = "Calculation Error";
}
}
function clearFields() {
document.getElementById("number1").value = "";
document.getElementById("number2").value = "";
document.getElementById("operator").value = "add";
document.getElementById("result-value").innerHTML = "–";
updateSecondNumberInputVisibility(); // Reset visibility
}
function updateSecondNumberInputVisibility() {
var operator = document.getElementById("operator").value;
var secondNumberGroup = document.getElementById("number2-group");
// Operations that require a second number
var binaryOps = ["add", "subtract", "multiply", "divide", "power"];
if (binaryOps.includes(operator)) {
secondNumberGroup.style.display = "flex";
} else {
secondNumberGroup.style.display = "none";
}
}
// Add event listener to the operator select element to change input visibility
document.getElementById("operator").addEventListener("change", updateSecondNumberInputVisibility);
// Initial check on page load
updateSecondNumberInputVisibility();
// Override default form submission to prevent page reload
document.querySelector('.calc-container form').addEventListener('submit', function(e) {
e.preventDefault();
calculate();
});