Odpowiedź :
f(x) = -x²-4x+1 dla x=3√2-2
f(x) = -(3√2-2)²-4(3√2-2)+1
f(x) = -(18-12√2+4)-12√2+8+1
f(x) = -18+12√2-4-12√2+9
f(x) =-13
f(x) = -(3√2-2)²-4(3√2-2)+1
f(x) = -(18-12√2+4)-12√2+8+1
f(x) = -18+12√2-4-12√2+9
f(x) =-13