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p= - b/2a
q= - Δ / 4a
2 = -b / 2*3 => -2 = b/6 => b=-12
-4= -[b²-4*3*c] / 4*3 => 4= b²-4*3*c / 4*3 => 4= 144-12c / 12 => 4= 12-c => c=8
f(x)=3x²-12x+8
sprawdzenie
f(2)=3*4-12*2+8=12-24+8=-4