HP 10413 Datasheet download pdf (Page 284)

284

The examples which follow are intended to illustrate the ways in which the

calculator can be used to help solve some typical problems. In some cases

more than one method is shown. Sometimes these problems are quoted

elsewhere in the book and repeated here for convenience.

Find the x intercepts of the quadratic equation

() 2 2 1gx x x

+−

Method 1 - Using the

QUAD

function in

HOME

This method is shown right, using the

key in the bottom view. The advantage of

doing it this way is that the answer is given in

the same form that you would see it if you

used the Quadratic formula. Just the result, edit and square the

decimal part to find the value of the

discriminant. The ‘S1’ is the calculator’s

version of the ± sign. Just the result and

remove the S1 to obtain the positive solution,

replacing the + with a - to obtain the other. This

method is only of use if the question said

“Show working” because it doesn’t give the answer directly. If you need the

result in surd form then copy just the decimal part and square it.

Method 2 - Using the Function aplet.

Shown right. Enter the function into

the SYMB view, use the VIEWS key

and choose ‘Decimal’. If the axes

don’t suit, then use the options. Now

use the option of Root to find the two

roots. One result is shown.

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HP 10413 Datasheet Page 284