If f(x) = 3x squared - 2, what is the value of f(4)?
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Correct answer to question 200 (Mathematics Knowledge): 46
Method
Substitute 4 for x: 4 squared is 16, and 3 x 16 = 48. Then 48 - 2 = 46. Squaring 3x instead of x alone gives 94, the common slip.
Updated: November 2026
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