x^2+kx+7=0, x1-x2=1, k-?. Created by tach78. algebra-ru

X²+kx+7=0x1+x2=-kx1×x2=7{x1+x2=-k{x1-x2=1x1+x2-x1-(-x2)=-k-1x1+x2-x1+x2=-k-12x2=-k-1|÷2x2=-(k+1)/2x1+x2+x1-x2=-k+12x1=1-k|÷2x1=(1-k)/2x1×x2=7((1-k)/2)×(-(k+1)/2)=7|×(-2)(1-k)×(1+k)=-141-k²=-14-k²=-14-1-k²=-15|×(-1)k²=15k1=-√15k2=√15Новые вопросы в АлгебраПодайте у вигляді суми квадратів двох виразів многочлен-25х2-24xу +9y2;в классе учатся 28 человек. в один день каждый принес по три фломастера красный,зеленый,синий.Могут ли ученики класса обменяться фломастерами так, что…у каждого оказалось 3 фломастера одинакого цветаvery very срочно!помогите пожалуйста.Постройте график функции y = (3x^2 + 4x)/x - (x^2 - 1)/(x + 1)даю 20 баллов за простенькое задание Нам дано число от 0 до бесконечности. Придумать формулу, которая будет преобразовывать это число от 30 до 12 соответственно. То есть бесконечность фор…мула будет преобразовывать в число 12. А ноль будет преобразовывать в 30. Например число между условной бесконечностью и нулем будет число 21. Придумать универсальную формулу, чтобы можна было подставлять числа.Пожалуйста помогитеab умножить на 2 сколько будет? срочно, даю 30 балловмолю про допомогу)) якщо мало ось мій інст))) Помогите пожалуйсто как ето решытьПредыдущийСледующийВместе мы знаем большеЭтот сайт использует cookies Политика Cookies . 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x^2+kx+7=0, x1-x2=1, k-?...

tach78 @tach78

July 2022 1 12 Report

x^2+kx+7=0, x1-x2=1, k-?

Answers & Comments

2407Alexa X²+kx+7=0

x1+x2=-k
x1×x2=7

{x1+x2=-k
{x1-x2=1

x1+x2-x1-(-x2)=-k-1
x1+x2-x1+x2=-k-1
2x2=-k-1|÷2

x2=-(k+1)/2

x1+x2+x1-x2=-k+1
2x1=1-k|÷2

x1=(1-k)/2

x1×x2=7

((1-k)/2)×(-(k+1)/2)=7|×(-2)
(1-k)×(1+k)=-14
1-k²=-14
-k²=-14-1
-k²=-15|×(-1)
k²=15

k1=-√15
k2=√15