Find the common chord of the circles x2+y2=16x^2 + y^2 = 16x2+y2=16 and x2+y2−4x=0x^2 + y^2 - 4x = 0x2+y2−4x=0.
x=3x = 3x=3
x=2x = 2x=2
x=1x = 1x=1
x=4x = 4x=4