помогите пожалуйста lg(x^{2}-9x)=1
lg(x²-9x)=1
x²-9x = 10
x²-9x-10=0
D=81+40=121
√D = 11
x1= 9+11/2 = 10
x2= 9-11/2 = -1
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lg(x²-9x)=1
x²-9x = 10
x²-9x-10=0
D=81+40=121
√D = 11
x1= 9+11/2 = 10
x2= 9-11/2 = -1