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K
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M
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P
P
L
L
E
E
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S
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.
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Find the x intercepts of the quadratic equation
2
() 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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