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Rezolvati in  R ecuatia  [tex] x^{2} [/tex] -7x=8

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Ctinamaria31xxxask
x^2-7x-8=0
a=1
b=-7
c=-8

Delta=b^2-4ac
delta=49-4*1*(-8)
delta=49-32
delta=17

x1=-b- radical din delta/2a
x1=7-radical din 17/2

x2=-b+radical din delta/2a
x2=7+ radical din 17/2
x²-7x-8=0
Δ=b²-4ac
Δ=49-32=81
[tex]x1= \frac{-b+ \sqrt{delta} }{2}
 x2= \frac{-b- \sqrt{delta} }{2} [/tex]
[tex]x1= \frac{7+9}{2} =8 x2= \frac{7-9}{2} =-1[/tex]

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