HP 40gs Manual do Utilizador descarregar pdf (Página 297)

100

101

Step-by-Step Examples 16-23

Solution 1

Start by defining G(X):

DEF G

= 2 X

X 2

Now press :

Press and to select

the numerator and

denominator, and then

press . This

leaves G(X) displayed:

Finally, apply the TABVAR

function:

TABVAR

and press a

number of times until

the variation table appears (shown above).

The first line of the variation table gives the sign of

according to x, and the second line the variations

of g (x). Note that for TABVAR the function is always

called F.

We can deduce, then, that g(x) increases over [0, 2].

If you had been in step-by-step mode, you would have

obtained:

Press to get the

result at the right.

g′ x()

2 X 3+⋅

X 2+

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