X^2-4X-96=0
Δ=4^2-4*1*(-96)=16+384=400
√Δ=20
X1=(4+20)\2*1=24\2=12
Х2=(4-20)\2*1=-16\2=-8
2X^2+8X-24=0
Δ=8^2-4*2*(-24)=64+192=256
√Δ=16
Х1=(-8+16)\2*2=8\4=2
Х2=(-8-16)\2*2=-24\2=-12
-X^2+3X+18=0
Δ=3^2-4*(-1)*18=9+72=81
√Δ=9
Х1=(-3+9)\(-1)*2=6\(-2)=-3
X2=(-3-9)\(-1)*2=-12\(-2)=6
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Answers & Comments
X^2-4X-96=0
Δ=4^2-4*1*(-96)=16+384=400
√Δ=20
X1=(4+20)\2*1=24\2=12
Х2=(4-20)\2*1=-16\2=-8
2X^2+8X-24=0
Δ=8^2-4*2*(-24)=64+192=256
√Δ=16
Х1=(-8+16)\2*2=8\4=2
Х2=(-8-16)\2*2=-24\2=-12
-X^2+3X+18=0
Δ=3^2-4*(-1)*18=9+72=81
√Δ=9
Х1=(-3+9)\(-1)*2=6\(-2)=-3
X2=(-3-9)\(-1)*2=-12\(-2)=6