Đồ thị 1

m = -1.8 (slider from -10 to 10, step 0.1)
f(x) = (-1.0 * x^(2.0) + m * x + 1.0) / (x - m)
a: 1.0 * 1.0 * 1.0 x = m
g(x) = -1.0 * x