Evaluate Expressions Practice 1. Evaluate the expression at specific values of their variables
To evaluate an expression at specific values of their variables, substitute the given values into the expression and simplify.
Example 1:
Evaluate the expression 3x + 5 when x = 2.
Substitute x = 2 into the expression:
3(2) + 5
Simplify the expression:
6 + 5 = 11
Therefore, when x = 2, the expression 3x + 5 evaluates to 11.
Example 2:
Evaluate the expression x^2 - 2x + 3 when x = -1.
Substitute x = -1 into the expression:
(-1)^2 - 2(-1) + 3
Simplify the expression:
1 + 2 + 3 = 6
Therefore, when x = -1, the expression x^2 - 2x + 3 evaluates to 6.