Resolva as equações do 2 grau.... Pergunta de ideia detakedrauhl

takedrauhl @takedrauhl

October 2020 1 47 Report

Resolva as equações do 2 grau

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iziscaroline17 G) -3x²+7x-2=0
Δ= b²-4.a.c
Δ= 49 -4.(-3).(-2)
Δ= 49-24
Δ= 25
x= -b+ou-√Δ/2.a
x= -7+ou-√25/-6
x¹= -7+5/-6 = $\frac{1}{3}$
x²= -7-5/-6= $\frac{-12}{-6}$ = 2

i) 4y²-4y+1=0
Δ= 16-4.4.1
Δ=16-16
Δ=0 (obs: quando Δ=0 tem somente uma raiz porque as duas são iguais)
x= 4+ou-√0/8
x= 4/8 = 1/2

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