Предмет: Алгебра, автор: Аноним

Розв*жіть рівняння: 5(х+2)²+(2х-1)²-9(х+3)(х-3)=22

Ответы

Автор ответа: Аноним

5( x + 2 )² + ( 2x - 1 )² - 9( x + 3)( x - 3 ) = 22
5( x² + 4x + 4 ) + 4x² - 4x + 1 - 9( x² - 9 ) = 22
5x² + 20x + 20 + 4x² - 4x + 1 - 9x² + 81 = 22
16x = 22 - 102
16x = - 80
x = - 5

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