Предмет: Математика, автор: aan854721

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Автор ответа: MuhammadGulu

$49a - 4 {a}^{3} = a(49 - 4 {a}^{2} ) = a(7 - 2a)(7 + 2a)$

$(7c - 7) {}^{2} - {25c}^{2} = {49c}^{2} - 98c + 49 - {25c}^{2} = {24c}^{2} - 98c + 49$

Автор ответа: Аноним

$\displaystyle 1)49a-4a^3=a(49-4a^2)=a(7-2a)(7+2a)\\\\2)(7c-7)^2-25c^2=(7c-7-5c)(7c-7+5c)=(2c-7)(12c-7)$

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