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When you have an algebraic expression with variables in it, you need to know the the value of each variable. The value of the expression is found by replacing the variables with their values and simplifying.
For example, evaluate 2xy-3x if x=5 and y=-1.
2xy-3x = 2*5*(-1) -3*5 = -10-15 = -25.
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What does it mean to evalutate the expression?
Replace each variable in the expression by its value and then find the value of the expression.
How do you find the value of an algebraic expression?
Take the value of each variable in the expression and replace the variable by its value. Then do the math!
What is the value of the expression when x9?
The answer will depend on the expression - which is not given!
The value that results from the substitution of a given input into an expression or function?
The value that results from the substitution of a given input into an expression or function is the output. The value substituted into an expression or function is an input.
How do you evaluate an algebraic expression when I know the value of each variable?
Replace each variables in the algebraic expression by its [known] value and calculate the value (ie evaluate) of the algebraic expression.
