2. Grade 7 Mathematics
EVALUATING
AN
ALGEBRAIC
EXPRESSION

3. 1. replacing the
variable by the given
value
2. performing the
indicated arithmetic
following the order of
operations(GEMDAS)
Evaluation of algebraic expression involves two steps:

4. Evaluate
x + 3 ; if x=3
= (3) + 3
= 6

5. Evaluate
9a + 3; if a=6
= 9(6) + 3
= 54 + 3
=57

6. Evaluate
2a – 3b +4c ; if a=3, b=1, c=-2
=2(3) -3(1) + 4(-2)
=6 – 3 – 8
= -5

7. Evaluate
a2 + 2ab + b2 ; if a=2, b=5
=22 + 2(2)(5) + 52
= 4 + 20 + 25
= 49

8. Evaluate the following expressions
1. a3 + 9a + b
2. 9a2 + b2
3. a2 + a + 4b
4. 𝑎2+ 3b
5. 6a + b3
6. 3a2 + 2b
a=2
b=3

9. EXODUS

10. Exodus means . . .
•Departure
•Withdrawal
•Evacuation
•Leaving

11. Evaluate each algebraic expression.
1. a + b +c
2. 8ab +9c
3.
𝑎𝑐
𝑏
4. 𝑏2 + ac
5. (
𝑎
𝑐
)2
a=5
b=-5
c=7

12. Assignment
1.On your textbook, answer letter C on
page 82.
2.Read lesson 3.5 on pages 83-84.
Reference:
Elementary Algebra

13. Thank you for listening!