Functions f,g

Find g(1) if g(x) = 3x - x2

Find f(5) if f(x) = x + 1/2

Correct result:

g =  2
f =  5.5

Solution:

x=1 g=3⋅ x−x2=3⋅ 1−12=2x=1 \ \\ g=3 \cdot \ x - x^2=3 \cdot \ 1 - 1^2=2
x=5 f=x+1/2=5+1/2=112=5.5x=5 \ \\ f=x + 1/2=5 + 1/2=\dfrac{ 11 }{ 2 }=5.5

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