Ответы на вопрос:
1) ( 5 - y)² + 17 = ( y - 3)² ( 5 - y)( 5 - y) + 17 = ( y - 3)( y - 3) 25 - 5y - 5y + y² + 17 = y² - 3y - 3y + 9 y² - 10y + 42 = y² - 6y + 9 y² - 10y - y² + 6y = 9 - 42 - 4y = - 33 4y = 33 y = 33/4 y = 8,25 2) 7x + x ( x - 7) = ( 2x + 5)( 5 - 2x) 7x + x² - 7x = 10x - 4x² + 25 - 10x x² = - 4x² + 25 x² + 4x² - 25 = 0 5x² - 25 = 0 d = b² - 4ac d = 0² - 4 × 5 × ( - 25) = 0 + 500 = 500 x₁ = 0 + √500 / 10 = 10√5 / 10 = √5 x₂ = 0 - √ 500 / 10 = - 10√5 / 10 = - √5
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