Evaluating a 1-Variable Expression
Evaluate Expressions: Learn
A mathematic expression is a group of numbers and operators which can be evaluated to determine their value.
There may be a variable in the expression which represents a number that may or may not be known. A variable is simply a symbol used as a placeholder for the unknown number. Mathematicians frequently use "x" as the variable, but it could be anything, such as any letter of the alphabet, or even a smiley face drawing.
If we know the value of the variable, we can find the value of the entire expression.
For example, if x=3, then the expression 7x+4 can be evaluated in the following way:
7x+4 =7*3+4 =21+4 =25
The very first step where x is replaced by its value is called substitution.
Evaluate Expressions: Practice
Evaluate using the given value.
If x=, then
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