HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 172

hp40g+.book Page 18 Friday, December 9, 2005 1:03 AM LINEAR? QUAD QUOTE | (where) 13-18 Examples ISOLATE(2*X+8,X) returns -4 ISOLATE(A+B*X/C,X) returns -(A*C/B) Tests whether expression is linear for the specified variable. Returns 0 (false) or 1 (true). LINEAR?(expression, variable) Example LINEAR?((X^2-1)/(X+1),X) returns 0 Solves quadratic expression=0 for variable and returns a new expression, where variable=newexpression. The result is a general solution that represents both positive and negative solutions by including the formal variable S1 to represent any sign: + or - . QUAD(expression, variable) Example QUAD((X-1)2-7,X) returns (2+s1*(2*√7))/2 Encloses an expression that should not be evaluated numerically. QUOTE(expression) Examples QUOTE(SIN(45)) F1(X) stores the expression SIN(45) rather than the value of SIN(45). Another method is to enclose the expression in single quotes. For example, X^3+2*X F1(X) puts the expression X^3+2*X into F1(X) in the Function aplet. Evaluates expression where each given variable is set to the given value. Defines numeric evaluation of a symbolic expression. expression|(variable1=value1, variable2=value2,...) Example 3*(X+1)|(X=3) returns 12. Using mathematical functions