hi
First, dont keep the equation this way.
f(x) = 2 (x+2) +4x
f(x) = 2x+4+4x
f (x) = 6x+4
after :
x= 0 f(x) = 4
x= 2 f(x)= 16
x= 10 f(x) = 64
x = 30 f(x) = 94
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