x²+3x=54
x²+3x-54=0
D = b²-4ac => 3²-4*1*(-54) = 9+216 = √225 = 15>0, 2 корня.
x =
x₁ =
x₂ =
ответ: -9; 6.
x²+3x=54
x²+3x-54=0
D = b²-4ac => 3²-4*1*(-54) = 9+216 = √225 = 15>0, 2 корня.
x =![\frac{-b+-\sqrt{D} }{2a}](/tpl/images/0959/9896/c252a.png)
x₁ =![\frac{-3+15}{2} = \frac{12}{2} = 6](/tpl/images/0959/9896/f9ab4.png)
x₂ =![\frac{-3-15}{2} = \frac{-18}{2} = -9](/tpl/images/0959/9896/b8f3b.png)
ответ: -9; 6.