Mathematics for IGCSE & O level - Algebraic Manipulation (Section 8 - No. 5)

What is the value of 3x^2 + 2x - 1 when x = 2?

15

11

17

21

解释

Substitute x = 2: 3(2)^2 + 2(2) - 1 = 12 + 4 - 1 = 15.

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