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If x = 1/√5 – 2 than 2x³ – 5x² – 14x – 3 = ?

0

1

5

3

Explanation:

x = 1 /√5 – 2
x = √ 5 + 2
x – 2 = √5
x² – 4x + 4 = 5
x² – 4x – 1 = 0

∴ 2x³ – 5x² – 14x – 3 = (x² – 4x – 1) (2x + 3) = 0

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