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4ײ-9=ײ+10×+16
3ײ-10×-25=0
Δ=b²-4ac
Δ=10²-4*3*(-25)
Δ=400
√Δ=20
x1=-b-√Δ/2a
x2=-b+√Δ/2a
x1=10-20/6= -5/3
x2=10+20/6 =5