-5x²+4x+1=0 | *-1
5x^2-4x-1=0
дескриминант= 16+4*5*1=36=6^2
x=(4+-6)\10=1 ; -1\5=0.2
(x-1)(x+1\5)
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-5x²+4x+1=0 | *-1
5x^2-4x-1=0
дескриминант= 16+4*5*1=36=6^2
x=(4+-6)\10=1 ; -1\5=0.2
(x-1)(x+1\5)