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What do you call replacing a variable in an expression by a number?

A variable is a letter that represents a number. An expression that contains at least one variable is called variable expression, also called algebraic expression. A variable expression has one or more terms. A term is a number, a variable, or a product of numbers and variables. For example,3(x^2)y + 2xy + x - 7 is a variable expression, where you have 4 terms.When working with variable expression, you often use the substitution principle:If a = b, then a may be replaced by b in any expression.The set of numbers that a variable may be represent is called replacement set, or domain, of the variable. To evaluate a variable expression, you replace each variable with one of its values and simplify the numerical expression that results.Example: Evaluate the expression 2x - 4y for x = 5 and y = -9.Solution:2x - 4y= 2(5) - 4(-9)= 10 + 36=46


Is a variable a monomial?

A monomial is an expression that is either:1) a numeral,2) a variable,or 3) the product of a numeral and one or more variables.A variable can be thought of as the product of the numeral 1 and the variable, thus making it a monomial.


What does 2a mean in math?

In mathematics, the expression "2a" represents the product of 2 and the variable "a." This means that you are multiplying the number 2 by the value of the variable "a." The result will depend on the specific value assigned to the variable "a."


What is the variable in this algebraic expression 7d plus 2?

The variable is d, in the algebraic expression 7d+2


An expression with at least one variable and one operation?

2×+4×-5 An expression does not have an equal sign but can be solved has numbers, variables, and at least one operation


What is the Type of algebraic expressions and give two examples?

A variable is a letter that represents a number. A n expression that contains at least one variable is called a variable expression or an algebraic expression.A variable expression has one or more terms. A term is a number, a variable, or a product of numbers and variables.An algebraic expression consisting of only one term is called a monomial (3x, xy, 2y, xyz); of two terms is called a binomial (x + y, x^2 - 1, a + 2b); of three terms is called trinomial (x + 2y - 4, 3x^2 + 2xz +3). In general, an algebraic expression consisting of two or more terms is called a polynomial


What is the variable in the expression 3x - 5?

-2


What is the algebraic expression for the square of the sum of two numbers equals the sum of their squares plus twice their product?

Equation, not expression. A and B are two numbers. (A + B)2 = A2 + B2 + 2(AB) ----------------------------------


What is the variable in the algebraic expression 7d plus 2?

The variable is "d".


Which is the variable in the expression 5n 2?

N


What is the variable in the expression 7s - 5?

2


What is a Variable expression for x less then 2?

2-x