(5x+1)-(5x-3).(5x+3)= 0

(5x+1)-(5x-3).(5x+3)= 0

⇔(5x+1)-[ (5x)²-3²]=0

⇔(5x+1)-(25x²-9)=0

⇔5x+1-25x²+9=0

⇔-25x²+5x+10=0

⇔-5(5x²+x+2)=0

⇔5x²+x+2=0

⇒Δ=b²-4ac

⇔Δ=1²-4×5×2

⇔Δ=-39<0

⇒phương trình vô no

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