Предмет: Алгебра, автор: alisalisovskaa780

При якому значенні х скалярний добуток векторів а (х; -3) та ь (х; 2х) дорівнює -8?

Ответы

Автор ответа: tarasabc

Відповідь:

2 або 4

Пояснення:

$x*x-3*2x=-8\\x^2-6x+8=0\\\\$

За теоремою Вієта прикинемо що х1=4 х2=2

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