Question

Даю 100 баллов.........​

Answer 1

$\displaystyle\bf\\1)\\\\f(x)=0,4x-8\\\\f(x)=0 \ \ \Rightarrow \ \ 0,4x-8=0\\\\0,4x=8\\\\x=8:0,4=20\\\\Otvet \ : \ 20\\\\2)\\\\f(x)=\frac{x^{2} +x-30}{x+5} \\\\\\\left \{ {{x^{2} +x-30=0} \atop {x+5\neq 0}} \right. \ \ \Rightarrow\ \ \left \{ {{(x-5)\cdot(x+6)=0} \atop {x\neq -5}} \right. \\\\\\\left\{\begin{array}{ccc}x-5=0\\x+6=0\\x\neq -5\end{array}\right \ \ \Rightarrow \ \ \left\{\begin{array}{ccc}x=5\\x=-6\\x\neq -5\end{array}\right\\\\\\Otvet \ : \ 5 \ ; \ -6$