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### Grade 8 - Mathematics7.43 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 = 8 and ab = 12, find the value of a3+b3.226228224222 Q 2: If a+b = 10 and ab = 21, find the value of a3+b3.376378374370 Q 3: If a+b = 10 and ab = 16, find the value of a3+b3.540520530560 Q 4: If a+b = 5 and ab = 6, find the value of a3+b3.37333135 Q 5: If a+b = 12 and ab = 20, find the value of a3+b3.1004100810061002 Q 6: If a+b = 7 and ab = 12, find the value of a3+b3.91979593 Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!