Question

f(x)=-x2+8x-16
esse x2 o dois e em cima

Answer 1

Olá,

-x²+8x-16 = 0

a=-1 b=8 c=-16

Δ=b²-4.a.c

Δ=8²-4.(-1).(-16)

Δ=64-64

Δ=0

x=-b+-√Δ ÷ 2.a

x= -8+-√0 ÷ 2.(-1)

x= -8+-0 ÷ -2

x'= -8+0 ÷ -2 = -8 ÷ -2 = 4

x''= -8-0 ÷ -2 = -8 ÷ -2 = 4

Espero ter ajudado!!!

Answer 2

F(x)=-x2+8x-16 ( igualar a zero)

- x² + 8x - 16 = 0

a = - 1

b = 8

c = - 16

Δ = b² - 4ac

Δ = (+8)² - 4(-1)(-16)

Δ = + 64 - 64

Δ = 0

se

Δ = 0 ( única raiz)

(fórmula)

x = -b/2a

x = -8/2(-1)

x = - 8/-2

x = + 8/2

x = + 4

x = 4