Решебник по алгебре 7 класс Мерзляк ФГОС Задание 863

 

\[\boxed{\text{863\ (863).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]

\[y = 2 - 4x\]

\[1)\ x = 1 \Longrightarrow \ y = - 2\]

\[x = 0 \Longrightarrow \ \ y = 2\]

\[x = - 2 \Longrightarrow \ \ y = 10\]

\[2)\ y = - 4 \Longrightarrow \ \ x = 1,5\]

\[y = - 2 \Longrightarrow \ \ x = 1\]

\[y = 2 \Longrightarrow \ \ x = 0\]

\[3)\ y < 0\ \ при\ \ x > 0,5.\]

\[\boxed{\text{863.\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]

\[= (x + 4)\left( x^{2} - 20x + 100 \right) =\]

\[= (x + 4)(x - 10)^{2}\]

\[= \left( 36 - a^{2} \right)\left( - 1 - 2a - a^{2} \right) =\]

\[= (a - 6)(a + 6)(a + 1)^{2}\]

\[3)\ a^{2}(b - 1) - b^{2}(a - 1) =\]

\[= a^{2}b - a^{2} - ab^{2} + b^{2} =\]

\[= ab(a - b) - (a - b)(a + b) =\]

\[= (a - b)(ab - a - b)\]