Using the app

Try a formula with live numbers and send it to the calculator

Open a formula card, change the values, and tap Calculate to put the expression on your calculator.

Open in Trident

1. Open the reference library and search for a formula, for example "quadratic" or "distance".
2. Tap the card. Under Values, type numbers in the boxes or drag the sliders. The formulas on the right show their results straight away, and some cards draw a small graph that moves with your numbers.
3. Read "What it means" under the picture for a short explanation of the idea.
4. Tap Show keys on a formula to see the exact keys to press. Choose the Classic, Natural or RPN tab to match your calculator.
5. Tap Calculate. The library closes and the expression, filled in with your values, is typed into the calculator. If another model is needed, the app switches to it first.
6. Press the equals or enter key on the calculator to see the answer there.

Tips

• If a result says "no real value" (for example a negative number under a square root), Calculate is switched off for that formula.
• Formulas that use sin, cos or tan assume radians for the key presses. Set the calculator to RADIAN mode first.
• During exam practice the library may be hidden.

Related guides

• Browse the reference libraryFind shapes, formula cards, toolkits and labs, all in one searchable library.
• Use the exam-style formula sheetsOpen a one-page formula sheet for algebra, geometry, precalculus, calculus, statistics or physics, and print it.
• Solve a quadratic equationFind the roots of x² − 5x + 6 = 0 with a polynomial solver or the quadratic formula.