Resposta :
f(x)= x² - 4x +3 x=3
f(3)= (3)² - 4(3) +3
f(3)= 9 -12 +3
f(3)= -3 +3
f(3)= 0
f(3)= (3)² - 4(3) +3
f(3)= 9 -12 +3
f(3)= -3 +3
f(3)= 0
F(x)= x² - 4x +3
x=3
f(3)= (3)^2 - 4.(3) + 3
f(3)= 9 -12 +3
f(3)= -3 +3
f(3)= 0
x=3
f(3)= (3)^2 - 4.(3) + 3
f(3)= 9 -12 +3
f(3)= -3 +3
f(3)= 0