Question

Determine os zeros reais das funções:
B) f(x)= -x²+7x-12
C) f(x)= 3x²-7x+2
D) f(x)= x²-2x+2​

Answer 1

Resposta:

A)Δ=B²-4AC

Δ=(-7)²-4.3.4

Δ=49-48

Δ=1

X1=7+1/6

X1=8/6(SIMPLIFICANDO POR 2)= 4/3

X2=7-1/6

X2=6/6=1

As raizes são 1,4/3

b)xv=-b/2a

xv=7/2.3

xv=7/6

yv=-Δ/4a

yv=-1/12

c)

d)valor maximo y v=-1/12 e valor minimo xv=7/6