x2+6x=7
x2+6x-7 = 0
Вычислим дискриминант D
D = b2 - 4ac = ( + 6)2 – 4•1•( – 7) = 64
x1= -b+√D /2a=-6+√64/ 2*1=-6+8 /2=2 /2 = 1
x2 =-b–√D /2a= -6–√64 /2*1= -6–8 /2= -14 /2= -7
x2+6x=7
x2+6x-7 = 0
Вычислим дискриминант D
D = b2 - 4ac = ( + 6)2 – 4•1•( – 7) = 64
x1= -b+√D /2a=-6+√64/ 2*1=-6+8 /2=2 /2 = 1
x2 =-b–√D /2a= -6–√64 /2*1= -6–8 /2= -14 /2= -7