exam Maths Puzzle Numerical Ability

Graph f (x) = 2x.

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exam Other Question

Would someone please help me with this problem...
Given f(x)=x^2+3 and g(x)(sqrt)2-x find f o g(x).

a.5-x
b.1-x
c (sqrt)5-x^2
d. 7+x^2

Thanks can you explain to me step by step if I need to change the whole number into an improper fraction to work the problem