4х²+20х+1=0
D=400- 16= 384 √D=8√6
x₁= ( - 20+ 8√6) /8 = -2,5+ √6
x₂= ( - 20 - 8√6) /8 = -2,5 - √6
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4х²+20х+1=0
D=400- 16= 384 √D=8√6
x₁= ( - 20+ 8√6) /8 = -2,5+ √6
x₂= ( - 20 - 8√6) /8 = -2,5 - √6