Как вычислить поэтапно пример, который дан во вложении??

ответ:

возводим в квадрат обе части уравнения

умножаем на -1

d= (-1)-4*1*(-2)=9==±3

x=

x1=

x2=

x1=2

x2= - 1

проверка

равенство 2=2

равенство 1= - 1

ответ: х=2

график функции построен на картинке

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-10x=0-20

-10x=-20

x =-20*(-10)

x=2