Question

quais são as raizes da função definida por f(x)= -2x^2 +2x?

Answer 1

a = -2, b = 2, c = 0

Δ = b^2 – 4 . ac
Δ = 2^2 – 4 . -2 . 0
Δ = 4 – 0
Δ = 4

x = – b ± √Δ x’ = -2 + 2 = 0 =
2·a -4

x = – 2 ± √4 x” = -2 - 2 = -4 = 1
2. -2 -4 -4

Ou

-2x^2 + 2x = 0
x.( x – 2 + 2)
x’ = 0
x” = x – 2 + 2
x” = x
x” = 1