4. Evaluate the following: (1) 2a + 3b - c if a = 3, b = - 4, C = -2
(ii) a + b3 + c3 - 3abc if a = - 1, b = 2, c = 3
(iii) a + b3 + 3ab² + 3a²b if a = 2, b = -3
(iv) 5 + a² + ab - 9c if a = 5, b = 4, c = 0
(v) 6a - 5b2 + 2c- 3a²bc if a = 1, b = 2, c = -1
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