# User-defined quadratic function
f(x) = x**2 - 4*x + 3

set terminal png size 400, 300
set output 'quadratic_function.png'

set title "Quadratic Function: f(x) = x^2 - 4x + 3"
set xlabel "X-axis"
set ylabel "Y-axis"
set grid

# Plot the function
plot f(x) with lines title 'f(x) = x^2 - 4x + 3'