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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 7 - Mathematics
4.44 Solving Problems Using Formula for (a+b)2

Example: If (x+1/x) = 6 find x2+1/x2.
Solution: Given that (x+1/x) = 6 .
Take square on both sides.
(x+1/x)2 = 62
x2 + 2.x.1/x + (1/x)2  = 36
x2 + (1/x)2 = 36-2
x2 + (1/x)2 = 34
Directions: Solve the following problems. Also write at least ten examples of your own.
Q 1: If (x+1/x) = 5 find x2+1/x2.
25
27
23

 Q 2: If (x+1/x) = 15 find x2+1/x2.
216
225
223

Q 3: If (x+1/x) = 9 find x2+1/x2.
79
99
89

 Q 4: If (x+1/x) = 4 find x2+1/x2.
14
26
16

Q 5: If (x+1/x) = 7 find x2+1/x2.
47
49
59

 Q 6: If (x+1/x) = 20 find x2+1/x2.
402
450
398

Q 7: If (x+1/x) = 11 find x2+1/x2.
115
121
119

 Q 8: If (x+1/x) = 25 find x2+1/x2.
625
630
623

Question 9: This question is available to subscribers only!

 Question 10: This question is available to subscribers only!


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