Question

qual o valor minimo da função f(x)=5x-8x+2

Answer 1

f(x)=5x-8x+2
f(x)=-3x+2
-3x=2
x=3/2 [ x =1,5]

Answer 2

Xv= -b /2*a         a= 5  b= -8  c= 2

Xy= Δ/4*2                    

Δ=b²-4*5*2

Δ=(-8)²-4*5*2

Δ=64-40

Δ=24

Xv= -8/2*5 Xv -8/10 = 0,8

Xy= 24/20 Xy =20 Xy =  1,2

R=1,2