Предмет: Алгебра, автор: MISHKA20002

Решите уравнение (3-х)^2 - x^2= -15

Если можно то объясните откуда какое число берётся.

Ответы

Автор ответа: sedinalana
0
(a-b)(a+b)=a²-b²
(3-x-x)(3-x+x)=-15
3(3-2x)=-15
(3-2x)=-5
-2x=-8
x=4
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