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mechtanova7
@mechtanova7
October 2021
1
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Мне нужна помощь!!!!!!
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selmash21
798.
-3х^2-х+8=х^2-6х+9
-3х^2-х+8-х^2+6х-9=0
-4х^2+5х-1=0
4х^2-5х+1=0
д=25-4×4×1=9
х1=(5-3)/2×4=1/4
х2=(5+3)/2×4=1
797.
-х^2+3х+55=х^2+14х+49
х^2+14х+49+х^2-3х-55=0
2х^2+11х-6=0
д=121-4×2×(-6)=169
х1=(-11-13)/2×2=-6
х2=(-11+13)/2×2=1/2
792.
х^2+14х-25+4х^2-35х+47=0
5х^2-21х+22=0
д=441-4×5×22=1
х1=(21-1)/2×5=2
х2=(21+1)/2×5=2.2
793.
5х^2+5х-15-2х^2-11х-9=0
3х^2-6х-24=0
х^2-2х-8=0
д=4-4×(-8)=36
х1=(2-6)/2=-2
х2=(2+6)/2=4
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Answers & Comments
-3х^2-х+8=х^2-6х+9
-3х^2-х+8-х^2+6х-9=0
-4х^2+5х-1=0
4х^2-5х+1=0
д=25-4×4×1=9
х1=(5-3)/2×4=1/4
х2=(5+3)/2×4=1
797.
-х^2+3х+55=х^2+14х+49
х^2+14х+49+х^2-3х-55=0
2х^2+11х-6=0
д=121-4×2×(-6)=169
х1=(-11-13)/2×2=-6
х2=(-11+13)/2×2=1/2
792.
х^2+14х-25+4х^2-35х+47=0
5х^2-21х+22=0
д=441-4×5×22=1
х1=(21-1)/2×5=2
х2=(21+1)/2×5=2.2
793.
5х^2+5х-15-2х^2-11х-9=0
3х^2-6х-24=0
х^2-2х-8=0
д=4-4×(-8)=36
х1=(2-6)/2=-2
х2=(2+6)/2=4