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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 8 - Mathematics
7.45 Problems - IX

Example:
If x+1/x = 3, find the value of x3+1/x3.
Solution:
Given that,
x+1/x = 3
Cubing on both sides, we get
(x+1/x)3 = 33
x3+1/x3+3.x.1/x.(x+1/x) = 27
x3+1/x3+3.3 = 27
x3+1/x3+9 = 27
x3+1/x3 = 27-9
x3+1/x3 = 18


Directions: Solve the following problems.
Q 1: If x+1/x = 8, find the value of x3+1/x3.
488
484
482
486

Q 2: If x+1/x = 2, find the value of x3+1/x3.
6
4
2
8

Q 3: If x+1/x = 4, find the value of x3+1/x3.
52
56
58
54

Q 4: If x+1/x = 5, find the value of x3+1/x3.
113
117
119
115

Q 5: If x+1/x = 10, find the value of x3+1/x3.
970
975
965
960

Q 6: If x+1/x = 6, find the value of x3+1/x3.
196
194
192
198

Question 7: This question is available to subscribers only!

Question 8: This question is available to subscribers only!


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