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elenanovikova1972
@elenanovikova1972
August 2022
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надо решить уравнение: Х во второй степени - 20Х=-5Х-13-Х во второй степени
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adelinaataeva
Х²-20х=-5х-13-х²
х²-20х+5х+х²+13=0
2х²-15х+13=0
D=b²-4ac=-15²-4×2×13=225-104=121
√D=√121=11
x1,2=-b±√D/2,
x1=15+11/2=26/2=13
x2=15-11/2=4/2=2
Ответ: 13;2
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Answers & Comments
х²-20х+5х+х²+13=0
2х²-15х+13=0
D=b²-4ac=-15²-4×2×13=225-104=121
√D=√121=11
x1,2=-b±√D/2,
x1=15+11/2=26/2=13
x2=15-11/2=4/2=2
Ответ: 13;2