Question

Resolva as equaçoes do 2 grau abaixo:

x²-2x-3=0

Answer 1

Vamos lá

Calculo

X² - 2X - 3 = 0

Δ = b² - 4 * a*c

Δ= ( - 2 )² - 4 * 1 * ( - 3 )

Δ = 4 + 12

Δ = 16

X = - b ± √Δ / 2 * a

X = ( 2 ± √ 16 ) / 2 * 1

X = 2 ± 4 / 2

X1 = 2 + 4 / 2 = 6 / 2 = 3

X2 = 2 - 4 / 2 = -2 / 2 = - 1