penyelesaian dari akar persamaan 4x kuadrat -16 =0

4x²-16 = 0
a=4, b=0, c=-16
x = [- b±√(b²-4ac)]/2a
x = {0 ± √[0-4.4(-16)]}/(2.4)
x = ±16/8 = ±2