Dawnbridge

Casio fx-CG50 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

From the MAIN MENU, open Graph (icon 5) and type the function on Y1: . Press to register it.

RadNorm2
Real
Graph Func:Y=
Y1=ln(X+2)+X2
Y2:
Y3:
Y4:
Y5:
Y6:
SELECTDELETETYPETOOLMODIFYDRAW
2

Press to return to the MAIN MENU and open Run-Matrix (icon 1). Press , then (GRAPH), then (Y), then for the slot number. The entry line now reads Y1.

3

Type (1.6) with , then press to evaluate.

MathRadNorm2
d/cReal
Y1​(1.6)
3.840933845
JUMPDELETE▶MAT/VCTMATH
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.