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amina242004
@amina242004
July 2022
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х в квадрате -9х +14 =0
4х в квадрате -20х +21 =0
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scTFEKO
Х²-9х+14=0
D=9²-4*1*14=81-56=25
x1=(9+√25):2=14:2=7
x2=(9-√25):2=4:2=2
4x²-20x+21=0
D=20²-4*4*21=400-336=64
x1=(20+√64):8=28:8=3,5
x2=(20-√64):8=12:8=1,5
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Answers & Comments
D=9²-4*1*14=81-56=25
x1=(9+√25):2=14:2=7
x2=(9-√25):2=4:2=2
4x²-20x+21=0
D=20²-4*4*21=400-336=64
x1=(20+√64):8=28:8=3,5
x2=(20-√64):8=12:8=1,5