Question

determine as raizes das seguintes funçoes do 2 grau C)y = 4x - x²

Answer 1

y = -x²+4x

Δ = b²-4ac
Δ = 4²-4(-1)(0)
Δ = 16

x = -4+-4 / -2

x' = -4+4 / -2 = 0/-2 = 0

x'' = -4-4 / -2 = -8/-2 = 4