7. Evaluate each of the following algebraic expressions for x = 2, y = -3, z = -2, a = 2, b = 3:
(i) 2a2 + ab
(ii) 2a2 + x2 - y2
(iii) 4xy2 - 3yz2 + 4x2z
(iv) x3 + y + 3xyz + ab
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7. Evaluate each of the following algebraic expressions for x = 2, y = -3, z = -2, a = 2, b = 3:
(i) 2a2 + ab
(ii) 2a2 + x2 - y2
(iii) 4xy2 - 3yz2 + 4x2z
(iv) x3 + y + 3xyz + ab
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