Substitution and Evaluation
Substitution and Evaluation
Substitution: Replace each vairable with its indicated
value.
Evaluation: Simplify the expression with proper order of
operations.
Example: Evaluate the expression below if x = 3 and y = -2.
P
E
MD
AS
2  y  x   5x  2
2
2  2  3  5  3  2
2
2  5  5  3  2
2
2  25  5  3  2
50  15  2
63
Square Notation
Evaluate the following:
a.
5  5 5 25
2
Square -5
b.  5  5   25  25 The opposite of 5 squared
2
2
Evaluate the following if x = -3:
2

2
c. x  3  3 3  9 Square -3



2
2
d.  x   3  9  9 The opposite of -3 squared
 
