Evaluate Expressions Practice 1. Evaluate the expression at specific values of their variables

Answer 1

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.