Ответ:
б) x²+6x=9
x²+6x-9=0
D=b²-4ac=36-4•1•(-9)=36+36=72
x1= -b+√D/2a= -6+6√2/2=-3+3√2
x2= -b-√D/2a= -6-6√2/2= -3-3√2
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Ответ:
б) x²+6x=9
x²+6x-9=0
D=b²-4ac=36-4•1•(-9)=36+36=72
x1= -b+√D/2a= -6+6√2/2=-3+3√2
x2= -b-√D/2a= -6-6√2/2= -3-3√2