Getting started TI-85/86 calculators, 6
4 3757 • To put t h e commands on one line for possible later editing, press 7 STOI A
ALPHA 2nd : 6 STOI B ALPHA 2nd : 5 STOI C ALPHA 2nd : 4 S TOI
D ALPHA 2nd : ALPHA A + ALPHA B × ALPHA C ∧ ALPHA D so the screen
reads 7 → A : 6 → B : 5 → C : 4 → D : A+B ∗C∧D. Press ENTER to store the values of A, B, C
and D and calculate the answer. The colon (above the period key) separates two commands on
one line. The ALPHA keys are needed because STOI locks the calculator in upper-case alpha
mode.
5. 0.422549020007 • Use ( 1 ÷ 2 ) LOG ( 7 ) ENTER .
6. 1.3202247191 × 10
13
• Use ( 1 . 3 4 EE 6 − 4 EE 5 ) ÷ ( 7 . 1 2 EE
(–) 8 ) ENTER .
7. 2.00509554966 • Use 2nd
√
( 4 + 7 ∧ ( 8 − 1 0 ) ) ENTER .
8. 16 • TI-85 and TI-86 calculators evaluate x
1/n
for negative x and odd integers n, but do
not always give the correct, real value of x
m/n
with negative x, odd n, and m an integer
> 1. It is generally best to write x
m/n
as (x
m
)
1/n
for o d d n. The keys
(-) 3 2 ∧ (
4 ÷ 5 ) ENTER give the wrong result(−16) since the negation is perfomed after the
power. The sy mbols ( (-) 3 2 ) ∧ ( 4 ÷ 5 ) ENTER probably yield, on a TI-
85, (−12.94427191, 9.40456403668) representing −12.94427191 + 9.40456403668 i, which is the
approximate dec imal value of one of the complex four-fifth roots of −32, rather than the real
four-fifth root 16. These symbols, however, give the c orre ct result on a TI-86. The expressions
( (-) 3 2 ) ∧ 4 ∧ ( 1 ÷ 5 ) ENTER and ( (-) 3 2 ) ∧ ( 1 ÷ 5 )
∧ 4 ENTER give the correct result, since for any positive odd integer n and negative x, the
calculator interprets x ∧ (1/n) as the negative nt h root of x.
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