Please solve 24-31
Q24. Use (a –b)2 = a2 – 2ab + b2 to evaluate the following:
(i) (99)2 (ii) (997)2 (iii) (9.8)2.
Q25. By using suitable identities, evaluate the following:
(i) (103)3 (ii) (99)3 (iii) (10.1)3
Q26. If 2a – b + c = 0 , prove that 4a2 – b2 + c2 + 4ac = 0.
Hint. 2a – b + c = 0 2a + c = b (2a + c)2 = b2.
Q27. If a + b + 2c = 0. prove that a3 + b3 + 8c3 = 6abc.
Q28. If a + b + c = 0, then find the value of .
Q29. If x + y = 4, then find the value of x3 + y3 + 12xy – 64.
Q30. Without actually calculating the cubes, find the values of :
(i) (27)3 + (–17)3 + (–10)3 (ii) (–28)3 + (15)3 + (13)3.
Q31. Using suitable identify, find the value of :
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