Объяснение:
х2+4х-5 =0
D=b2-4ac=16-4×1×(-5)=
16+20=36
x1= -b+√D/2a = -4+6/2= 1
x2=-b -√D/2a=-4-6/2=-5
4) 2x²+ 3x-5= 0
D = b²-4ac= 9-4×2×(-5)= 49
x1= -b+√D/2a= -3+7/2×2= 1
x2=-b-√D/2a= -3-7/2×2=-2.5
Объяснение:
х2+4х-5 =0
D=b2-4ac=16-4×1×(-5)=
16+20=36
x1= -b+√D/2a = -4+6/2= 1
x2=-b -√D/2a=-4-6/2=-5
4) 2x²+ 3x-5= 0
D = b²-4ac= 9-4×2×(-5)= 49
x1= -b+√D/2a= -3+7/2×2= 1
x2=-b-√D/2a= -3-7/2×2=-2.5