Page 128 - Math Course 1 (Book 1)
P. 128
Exponents
2
Let’s Begin Evaluate x(y + 2) if x = 2 and y = –2.
x(y + 2)² = 2(–2 + 2)² Replace x with 2 and y
with –2.
Evaluate Numeric Expressions = 2(0)² Simplify the expression
inside the
parentheses.
Examples = 2(0) or 0 Evaluate (0)2.
Then simplify.
2
Evaluate 4 .
2
4 = 4 • 4 4 is a factor two times. Answer 0
= 16 Multiply.
Answer 16 Your Turn!
Evaluate Numeric Expressions
2
Evaluate 2 • 3 . 2
Evaluate 5 • 4 .
2 • 3² = 2 • 9 3 is a factor two times.
A. 8
= 18 Multiply. B. 20
C. 80
Answer 18 D. 81
Answer
Evaluate Algebraic Expressions
Evaluate Algebraic Expressions
Examples Evaluate the expression 100 – x if x = 2.
4
3
Evaluate r – 3 if r = –2. A. 92
B. 68
3
3
r – 3 = (–2) – 3 Replace r with –2. C. 98
D. 84
= (–2)(–2)(–2) – 3 –2 is a factor 3 times.
Answer
= –8 – 3 or –11 Multiply. Then
subtract. 3
Evaluate the expression m(5 – n) if m = –3 and
n = 3.
Answer –11 A. 216
B. 24
C. –24
D. –18
Answer
120
