Question

помогите пожалуйста ​

Answer 1

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

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

Answer 2

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