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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 8 - Mathematics
7.46 Problems - X

Example:
If x-1/x = 5, find the value of x3-1/x3.
Solution:
Given that,
x-1/x = 5
Cubing on both sides, we get
(x-1/x)3 = 53
x3-1/x3-3.x.1/x.(x-1/x) = 125
x3-1/x3-3.5 = 125
x3-1/x3-15 = 125
x3-1/x3 = 125+15
x3-1/x3 = 140


Directions: Solve the following problems. Also write at least ten examples of your own.
Q 1: If x-1/x = 4, find the value of x3-1/x3.
76
74
72
78

Q 2: If x-1/x = 2, find the value of x3-1/x3.
16
18
12
14

Q 3: If x-1/x = 3, find the value of x3-1/x3.
32
38
34
36

Q 4: If x-1/x = 6, find the value of x3-1/x3.
232
236
234
238

Q 5: If x-1/x = 7, find the value of x3-1/x3.
366
362
364
360

Q 6: If x-1/x = 9, find the value of x3-1/x3.
754
756
752
758

Question 7: This question is available to subscribers only!

Question 8: This question is available to subscribers only!


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