14 Graphics calculator instructionsFor example, to enter 2 £(4 + 1)we type 2 £ ( 4 + 1 ).We also use brackets to make sure the calculator understands the expression we are typing in.For example, to enter4+1^2 we type 2 ¥ ( 4 + 1 ). If we typed 2 ¥ 4 + 1 the calculator
would think we meant^24 +1.In general, it is a good idea to place brackets around any complicated expressions which need to be evaluated
separately.POWER KEYS
Both theTI-84 PlusandCasioalso have power keys that look like ^. We type the base first, press the
power key, then enter the index or exponent.For example, to enter 253 we type 25 ^ 3.Note that there are special keys which allow us to quickly evaluate squares.Numbers can be squared on bothTI-84 PlusandCasiousing the special key x^2.For example, to enter 252 we type 25 x^2.ROOTS
To enter roots on either calculator we need to use a secondary function (seeSecondary Function and Alpha
Keys).Texas Instruments TI-84 PlusTheTI-84 Plususes a secondary function key 2nd.We enter square roots by pressing 2nd x^2.For example, to enterp
36 we press 2nd x^236 ).The end bracket is used to tell the calculator we have finished entering terms under the square root sign.Cube roots are entered by pressing MATH 4: p^3 (.For example, to enter^3p
8 we press MATH 4 8 ).Higher roots are entered by pressing MATH 5 :px.For example, to enter^4p
81 we press 4 MATH 5 81 ).IGCSE
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y:\HAESE\IGCSE01\IG01_00\014IGCSE01_00.CDR Thursday, 2 October 2008 3:48:09 PM PETER