Yes they can, for example quadratic expressions are often written in the form, ax^2+bx+c, where x is a variable, and a,b,c are constants. If you have an expression such as 5x^2 - 3, then clearly a=5, c=-3 and b=0
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An algebraic expression. 4 = the constant and coefficient term. d = the variable term.
A zero. Zero in the denominator make the expression undefined for algebraic purposes.
A term.
classifacation of algebraic expression according to the number of terms
Rob Schneider