Question

determine as raizes (zeros) reais da função: y=4x-x ao quadrado

Answer 1

4x-x²
-x²+4x=0

∆=4²-4.(-1).0
∆=16

x'=-4+√16/2.(-1)=-4+4/-2=0/-2=0
x''=-4-√16/2.(-1)=-4-4/-2=-8/-2=4