Example 2: Simplifying surds
Simplify the surd expression:
218 − 72 + 75
i. Begin by entering the expression:
2 SHIFT 18 SHIFT SHIFT 72
SHIFT 75
ii. Now simplify each surd in turn
(assuming working is desired):
ENTER
ENTER
ENTER
and press
ENTER to simplify:
iii. Finally, select the entire expression with SHIFT
iv. If you want the result as a decimal, press
NUM. Pressing SHIFT
NUM
will cause the calculator to analyze the decimal and re-instate
the surd.
342
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