Предмет: Геометрия, автор: ismoilirulsan

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Автор ответа: faizullina72

1

Ответ:

4.

$( x - 6)^2 - 2x( - 3x - 6) = x^2 - 12x + 36 + 6x^2 + 12x = 7x^2 + 36$

5.

$5y + 2(3 - 4y) = 2y + 21$

$5y + 6 - 8y = 2y + 21$

$- 3y + 6 = 2y + 21$

$5y = 15$

$y = - 3$

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