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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 7 - Mathematics
3.2 Find the Value of the Expression

Example: Find the value of x3 when x=2.
Solution:Substituting x value in the given expression, we get
23 = 2.2.2 = 8

Example: Find the value of x3 when x=-3.
Solution: Substituting x value in the given expression, we get
(-3)3 = (-3).(-3).(-3) = -27

Importance of enclosing the substituted value in parenthesis

Example: Evaluate 5 - x2 for x=-2
Solution 1: Substituting x value in the given expression, with parentheses
5 - (-2)2 = 5 - (-2).(-2) = 5 - 4 = 1 ------> Correct answer

Solution 2: Substituting x value in the given expression, without parentheses
5 - (-2)2 = 5 - -22 = 5 - -4 = 5 + 4 = 9 ------> Incorrect answer


Directions: Find the value of given expressions. Also write at least ten examples of your own.
Q 1: Find the value of 9(3x-2) when x=2.
32
36
34
30

Q 2: Find the value of 3(2x2+1) when x=1.
8
6
7
9

Q 3: Find the value of (3x-1)2 when x=1.
1
4
2
3

Q 4: Find the value of 2x3 when x=4.
128
111
145
95

Q 5: Find the value of 7x2+9 when x=3.
74
76
70
72

Q 6: Find the value of 3x3-2 when x=2.
22
21
26
24

Question 7: This question is available to subscribers only!

Question 8: This question is available to subscribers only!


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