надо решить уравнение: Х во второй степени - 20Х=-5Х-13-Х во второй степени. Created by elenanovikova1972. algebra-ru

надо решить уравнение: Х во второй степени - 20Х=-5Х-13-Х во второй степени...

elenanovikova1972 @elenanovikova1972

August 2022 1 26 Report

надо решить уравнение: Х во второй степени - 20Х=-5Х-13-Х во второй степени

Answers & Comments

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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