02.04.2022

стороны прямоугольника, если его площадь равна 84 см квадратных

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Математика

Вопрос школьника по предмету Математика

стороны прямоугольника, если его площадь равна 84 см квадратных

Ответ учителя по предмету Математика

x(x+5)=84;

x^2+5x-84=0;

D=25+336=361>0

x1=-5+19/2=7;

x2=-5-19/2=-12- не подходит по смыслу задачи

Тогда x=7(первая сторона),а x=7+5=12(вторая сторона)

Ответ: 7, 12.

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