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Question
Find the value of 3x3 – 4x2 + 5x – 6, when x = − 1.
Solution
3x3 – 4x2 + 5x – 6
= 3(− 1)3 − 4(− 1)2 + 5(− 1) − 6
= 3 × − 1 − 4 × 1 − 5 − 6
= − 3 − 4 − 5 − 6
= − 18
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