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Mathematics for IGCSE & O level - Functions (Section 3 - No. 48)

If f(x) = 2x + 1 and g(x) = x - 3, what is f(g(x))?
2x - 5
2x - 2
2x - 3
2x + 7

Explicaţie

f(x-3) = 2(x-3)+1 = 2x-6+1 = 2x - 5

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