Răspuns :
Δ=b²-4ac
Δ=7²-4*2*5
Δ=49-40
Δ=9
x1,2=-b+-√Δ/2a
x1=-7+√9/2*2
x1=-7+3/4
x1=-4/4
x1/-1
x2=-7-√9/2*2
x2=-10/4=-5/2
Δ=7²-4*2*5
Δ=49-40
Δ=9
x1,2=-b+-√Δ/2a
x1=-7+√9/2*2
x1=-7+3/4
x1=-4/4
x1/-1
x2=-7-√9/2*2
x2=-10/4=-5/2