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ruslanruslan1
@ruslanruslan1
July 2022
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Распишите пожалуйста.
1) Х квадрат-7х-18=0
2) Х квадрат+6х-27=0
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KatePlo
Х^2-7x-18=0
a=1 b=-7 c=-18
D=b^2-4ac=7^2-4*1*(-18)=49+72=121=11^2
x1x2=(-b+-Dпод корнем)/2*a=(7+-11)/2=9,(-2)
х^2+6x-27=0
a=1 b=6 c=-27
D=b^2-4ac=6^2-4*1*(-27)=36+108=144=12^2
x1x2=(-b+-Dпод корнем)/2*a=(-6+-12)/2=3,(-9)
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Answers & Comments
a=1 b=-7 c=-18
D=b^2-4ac=7^2-4*1*(-18)=49+72=121=11^2
x1x2=(-b+-Dпод корнем)/2*a=(7+-11)/2=9,(-2)
х^2+6x-27=0
a=1 b=6 c=-27
D=b^2-4ac=6^2-4*1*(-27)=36+108=144=12^2
x1x2=(-b+-Dпод корнем)/2*a=(-6+-12)/2=3,(-9)