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Mathematics for IGCSE & O level - Functions (Section 2 - No. 19)

If f(x)= 2x and g(x) = x+1, then what is g(f(x))?
2x+1
2x^2+2x
2x
x+3

Forklaring

g(f(x)) = g(2x) = 2x + 1

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