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ILoveChemistry2
@ILoveChemistry2
August 2021
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mikael2
3+√8+x=1-x 1-x≥0 x≤1 8+x≥0 x≥-8
√8+x=-2-x
8+x=4+4x+x² x²+3x-4=0 x1=-4 x2=1
проверим 3+√8-4=5 1-(-4)=5
x=-4
3+√9=6 1-1=0 6≠0 лишний корень
√12+x-√7x+8=-2 12+x≥0 x≥-12 7x+8≥0 x≥-8/7
2+√12+x=√7x+8
4+12+x+4√12+x=7x+8
4√12+x=6x-8 16x+192=36x²-96x+64
36x²-112x-128=0 √D=√12544+18432=176
x1
=1/72[112+176]
=4
x2
=1/72[112-176]=-32/36
=-8/9
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Answers & Comments
√8+x=-2-x
8+x=4+4x+x² x²+3x-4=0 x1=-4 x2=1
проверим 3+√8-4=5 1-(-4)=5 x=-4
3+√9=6 1-1=0 6≠0 лишний корень
√12+x-√7x+8=-2 12+x≥0 x≥-12 7x+8≥0 x≥-8/7
2+√12+x=√7x+8
4+12+x+4√12+x=7x+8
4√12+x=6x-8 16x+192=36x²-96x+64
36x²-112x-128=0 √D=√12544+18432=176
x1=1/72[112+176]=4 x2=1/72[112-176]=-32/36=-8/9