a) 2x²+2x-40=0
equação do segundo grau!!!
brenda973:
2x2+2x-40=0
soma = -b/a=-2/2=-1
2x2+2x-40=0.....(2)
x2+x-20=0
Soluções para a tarefa
Respondido por
1
a=2 ; b=2 ; c=-40
Δ=b²-4ac
Δ=2²-4.2.(-40)
Δ=4+320
Δ=324
x=![\frac{-b+-<strong></strong>[tex] \sqrt{Δ}](https://tex.z-dn.net/?f=%5Cfrac%7B-b%2B-%3Cstrong%3E%3C%2Fstrong%3E%5Btex%5D++%5Csqrt%7B%CE%94%7D++ "\frac{-b+-<strong></strong>[tex] \sqrt{Δ}")
}{2a}[/tex]
x=![\frac{-2+-[tex] \sqrt{324}](https://tex.z-dn.net/?f=%5Cfrac%7B-2%2B-%5Btex%5D+%5Csqrt%7B324%7D "\frac{-2+-[tex] \sqrt{324}")
}{2.2}
x=
![\left \{ {{x=[tex]\frac{-2-18}{4}](https://tex.z-dn.net/?f=+%5Cleft+%5C%7B+%7B%7Bx%3D%5Btex%5D%5Cfrac%7B-2-18%7D%7B4%7D "\left \{ {{x=[tex]\frac{-2-18}{4}")
=-5} \atop {x=
=4}} \right. [/tex]
Δ=b²-4ac
Δ=2²-4.2.(-40)
Δ=4+320
Δ=324
x=
x=
x=
Respondido por
2
2x· x-2 ·1=0
8x·(x-2)=0
8 ·x=0
x=0
2 x'=0
x-2=0
x+2=0
x''=2
8x·(x-2)=0
8 ·x=0
x=0
2 x'=0
x-2=0
x+2=0
x''=2
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