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f(x kuadrat) + 3 f(x) - (f(x))kuadrat=?
(X kuadrat + 2) + 3(x+2) - (x+2)kuadrat
x kuadrat+2+3x+6-(x kuadrat+4x+4)
X kuadrat +3x+8- x kuadrat -4x-4
-x+4
g(x) 2x+3