The Precalculus TI-83/TI-84 Tutorial

If the base is a fraction, be sure to enclose it within parentheses. For example, evaluate f(x) = (1/2)^x

for x = 4 and x = -3/4.

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We used the Frac command for the first example because the base led us to expect a fraction for an answer. In the second example, parentheses are required around the base AND the exponent. Whenever the exponent is a fraction or an expression, parentheses are necessary.