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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 8 - Mathematics
7.43 Problems - VII

Example:
If a+b = 8 and ab = 15, find the value of a3+b3.
Solution:
Given that,
a+b = 8
Cubing on both sides, we get
(a+b)3 = 83
a3+b3+3ab(a+b) = 512
a3+b3+3.15.8 = 512
a3+b3+360 = 512
a3+b3 = 512 - 360
a3+b3 = 152

Directions: Solve the following problems. Also write at least ten examples of your own.
Q 1: If a+b = 12 and ab = 20, find the value of a3+b3.
1002
1006
1004
1008

 Q 2: If a+b = 10 and ab = 16, find the value of a3+b3.
560
540
520
530

Q 3: If a+b = 5 and ab = 6, find the value of a3+b3.
33
35
31
37

 Q 4: If a+b = 10 and ab = 21, find the value of a3+b3.
376
370
378
374

Q 5: If a+b = 7 and ab = 12, find the value of a3+b3.
91
97
93
95

 Q 6: If a+b = 8 and ab = 12, find the value of a3+b3.
228
222
226
224

Question 7: This question is available to subscribers only!

 Question 8: This question is available to subscribers only!


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