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IrinaArinaRina
@IrinaArinaRina
July 2022
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chamomile03
Verified answer
1) 11x²-6x-27=8x²-6x
11x²-8x²-6x+6x=27
3x²=27
x²=9
x₁=-3
x₂=3
2) 26+5y-0.5y²=2.5y²+26
-0.5y²-2.5y²+5y+26-26=0
-3y²+5y=0
3y²-5y=0
y(3y-5)=0
y₁=0 или 3у-5=0
3у=5
у₂=5/3=1целая2/3
3) -7х²+13х+9=-19+13х
-7х²+13х-13х=-19-9
-7х²=-28
7х²=28
х²=4
х₁=-2
х₂=2
4) 21z+11=11+17z-5z²
5z²+21z-17z+11-11=0
5z²+4z=0
z(5z+4)=0
z₁=0 или 5z+4=0
5z=-4
z₂=-4/5
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Answers & Comments
Verified answer
1) 11x²-6x-27=8x²-6x11x²-8x²-6x+6x=27
3x²=27
x²=9
x₁=-3
x₂=3
2) 26+5y-0.5y²=2.5y²+26
-0.5y²-2.5y²+5y+26-26=0
-3y²+5y=0
3y²-5y=0
y(3y-5)=0
y₁=0 или 3у-5=0
3у=5
у₂=5/3=1целая2/3
3) -7х²+13х+9=-19+13х
-7х²+13х-13х=-19-9
-7х²=-28
7х²=28
х²=4
х₁=-2
х₂=2
4) 21z+11=11+17z-5z²
5z²+21z-17z+11-11=0
5z²+4z=0
z(5z+4)=0
z₁=0 или 5z+4=0
5z=-4
z₂=-4/5