Question

Determinar os zeros da função f(x)=-x²+4x-5

Answer 1

/\=4^2-4.1.(-5)
/\=16+20
/\=36

X=-4±V36 / 2.1
X=-4±6/2
X'=-4+6/2. -2/2=-1
X"=-4-6/2. -10/2=-5