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Hyrons
@Hyrons
December 2019
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Qual a resposta dessa conta?
(x-4).(x+8)=0
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ribeiromila
X²+8x-4x-32
X²+4x-32
Faz baskara:
Δ=b²- 4ac
4²-4(1)(-32)
16+ 128
Δ= 144
-b +-√Δ÷ 2a
-4+- 12÷2
X¹
= -4+12÷2= 8÷2=
4
X²
= -4-12÷2= -16÷2=
-8
Substitui as raizes na equação
(
x-4) (x+8)
X¹= (4-4)(4+8)=0
(0)(12)=0
0=0 Logo pode ser !
X²= (-8-4)(-8+8)=0
(-12)(0)=0
0=0 Logo pode ser !
2 votes
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Lista de comentários
X²+4x-32
Faz baskara:
Δ=b²- 4ac
4²-4(1)(-32)
16+ 128
Δ= 144
-b +-√Δ÷ 2a
-4+- 12÷2
X¹= -4+12÷2= 8÷2= 4
X²= -4-12÷2= -16÷2= -8
Substitui as raizes na equação
(x-4) (x+8)
X¹= (4-4)(4+8)=0
(0)(12)=0
0=0 Logo pode ser !
X²= (-8-4)(-8+8)=0
(-12)(0)=0
0=0 Logo pode ser !