Х1=(-b+ √D):2а =(5+9):2=7
Х2=(-b-√D):2а =(5-9):2=-2
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-x^2-5x+14=0
x^2+5x-14=0
D=в^2-4ac=5^2 - 4*1*(-14)=25 +56=81
Х1=(-b+ √D):2а =(5+9):2=7
Х2=(-b-√D):2а =(5-9):2=-2