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Simplify 3x (4x −5) + 3 and find its values for (i) x = 3, (ii) x = 1/2.

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3x (4x − 5) + 3 = 12x2 − 15x + 3

(i) For x = 3, 12x2 − 15x + 3 = 12 (3)2 − 15(3) + 3

= 108 − 45 + 3

= 66

(ii) For 

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