Question

As raizes da funçao y=x² -4x

Answer 1

$\frac{-(-4)+- \sqrt{(-4)^2-4*1*0} }{2*1} = \frac{4+- \sqrt{16-0} }{2} = \frac{4+- \sqrt{16} }{2} = \frac{4+-4}{2}$

x1= 8/2= 4
x2= 0