Предмет: Алгебра, автор: alikova2020s

Помогите пожалуйста! Даю 20 баллов!

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Автор ответа: michindjeva

$\sqrt{ {y}^{2} - 10y + 25 } - \sqrt{ {y}^{2} - 14y + 49} = \\ \sqrt{ {(y - 5)}^{2} } - \sqrt{ {(y - 7)}^{2} } = \\ 5 - y - (7 - y) = 5 - y - 7 + y = \\ - 2$

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