Предмет: Алгебра, автор: temnaalosadka400

49 $x^{2}$ -(2-7x) $^{2}$ упростить выражение

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Автор ответа: manyny06

0

Ответ:

решение смотри на фотографии

Приложения:

Автор ответа: NNNLLL54

0

Ответ:

Применяем формулу разности квадратов $a^2-b^2=(a-b)(a+b)$ .

$49x^2-(2-7x)^2=(7x)^2-(2-7x)^2=\Big(7x-(2-7x)\Big)\Big(7x+(2-7x)\Big)=\\\\=(7x-2+7x)(7x+2-7x)=(14x-2)\cdot 2=28x-4$

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