Предмет: Математика, автор: borisantipin2

5x в квадрате+4x-1=0 решение уравнения с дискриминантом

Ответы

Автор ответа: Іра0405
0
будем решать через Д
Д= в( в квадрате) - 4ас
Д=16-4*5*(-1)=16+20=36
Д= корень с 36=6
х1=-в- корень с Д/ 2а= -4-6/2*5=-24/10=-2,4
х2=-в+ корень с Д/ 2а=-4+6/10=0,2
Автор ответа: Іра0405
0
давай
Автор ответа: borisantipin2
0
вот 28x в квадрате-36x+11=0
Автор ответа: Іра0405
0
а=28, в=-36, с=11
Д=в (в квадрате)-4ас
Д=1296-4*28*11=1296-1232=64
Д= корень с 64=8
Автор ответа: borisantipin2
0
-49x в квадрате + 21x-2=0
Автор ответа: Іра0405
0
все домножаем на -1
а=49,в=-21,с=+2
Д=в (в квадрате)-4ас
Д=21 в квадрате -4*49*2=441-392=49
Д=корень с 49=7
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