Dawnbridge

TI-Nspire CX II field manual for IB Math

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13

Evaluating a stored function

All courses

Store a function in the graph editor, then recall it on the calculation screen to evaluate f(a) at a chosen point.

Goal

Evaluate ​y=ln(x+2)+x2​ at ​x=1.6.

1

Open the Scratchpad's Graph view ( → B: Graph Scratchpad) and enter the function on f1(x)=. Press then for the ln template; type ; press to leave the template, then type . Press to register the function.

Scratchpad
RAD
f1(x)=ln(x+2)+x2
2

Press to switch to Calculate Scratchpad. Then press and choose f1; the calculator pastes f1( for you.

3

Type the input with , close the bracket with , and press to evaluate.

Scratchpad
RAD
f1​(1.6)
3.84093
Result

At ​x=1.6, the function value is approximately ​3.84.

Your turn

Work each one on your calculator, then check the answer.

  1. 1

    Evaluate ​f(x)=ln(x+4)−x​ at ​x=1.8.

  2. 2

    Evaluate ​f(x)=ex−x3​ at ​x=2.3.

  3. 3

    Evaluate ​f(x)=e0.5x+x2​ at ​x=2.2.