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If g(x) = x 2 + x –1 and (gof) (x) = 4x 2 – 10x + 5, then f ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ 4 5 is equal to:

1. 2 3 −
2. 2 1 −
3. 2 3
4. 2 1

Correct answer: 2 1 −

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