Seudónimo Seudónimo
  • 14-04-2017
  • Mathematics
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garrrrryy

no need to show work
two questions
thankks

garrrrryy no need to show work two questions thankks class=
garrrrryy no need to show work two questions thankks class=

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Kmieteczka
Kmieteczka Kmieteczka
  • 14-04-2017
1. [tex]x^2-x-72=0[/tex]
[tex]\Delta=(-1)^2-4*1*(-72)=1+288=289[/tex]
[tex]\sqrt{\Delta}=17[/tex]
[tex]x_1=\frac{1-17}{2}=-8[/tex]
[tex]x_2=\frac{1+17}{2}=9[/tex]

2. [tex]f(x)=x^2+12x+20[/tex]
[tex]\Delta=144-80=64[/tex]
[tex]\sqrt{\Delta}=8[/tex]
[tex]x_1=\frac{-12-8}{2}=-10[/tex]
[tex]x_2=\frac{-12+8}{2}=-2[/tex]
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