HP -225 Owner's Manual page 87

For example:
AxB~3=C is interpreted as A X B3 = C. To raise A X B to the 3rd
power, enter (AXB>"3=C.
A+B+C=12 is interpreted as A + (B + C) = 12. To divide the sum
of A+ B by C, enter (AR+B>+C=12.
In interpreting CHG(T+12 : A-6> "2, the Solver evaluates the argu-
ments T + 12 and A — 6, computes the value of the function, and
then squares the function value.
B You cannot use parentheses for implied multiplication. For exam-
ple, the expression P(1—F) must be entered as Px(1-F>, with the
x operator inserted between P and the parenthesis.
Example: Using the Syntax Rules To Write an Equation. The fol-
lowing equation calculates the perimeter of a trapezoid. The equation
is written as it might appear in a book:
Perimeter = a + b + h ( ,1 + ——1—>
sin 0 sin ¢
The following equation obeys the syntax rules for HP-22S equations:
Parentheses used to group terms
P=A+B+HX(1+SINCT)+1+SINCFJ)
7
Single No implied Division is done
letter multiplication before addition
name
6: Evaluating and Solving Equations 79