Odpowiedź:
4x²-5x=0
a= 4 b= -5 c=0
Δ= b²-4ac
Δ= (-5)²-4*4*0
Δ= 25-0
Δ=25
√Δ= √25=5
x₁= -b-√Δ/2a
x₁= 5-5/2*4= 0/8= 0
x₂= -b+√Δ/2a
x₂= 5+5/2*4= 10/8= 5/4
