0\\\\D/4=36\; ;\; \; x_1=-0,4\; \; ;\; \; x_2=2\\\\5(x+0,4)(x-2)>0\; ,\; \; \; \; +++(-0,4)---(2)+++\\\\x\in (-\infty ;-0,4)\cup (2,+\infty )\\\\2)\; \; y=lg(4-x)-lg(x+7)\\\\OOF:\; \; \left \{ {{4-x>0} \atop {x+7>0}} \right. \; \; \left \{ {{x<4} \atop {x>-7}} \right. \; \; \Rightarrow \; \; \; -70\\\\D/4=36\; ;\; \; x_1=-0,4\; \; ;\; \; x_2=2\\\\5(x+0,4)(x-2)>0\; ,\; \; \; \; +++(-0,4)---(2)+++\\\\x\in (-\infty ;-0,4)\cup (2,+\infty )\\\\2)\; \; y=lg(4-x)-lg(x+7)\\\\OOF:\; \; \left \{ {{4-x>0} \atop {x+7>0}} \right. \; \; \left \{ {{x<4} \atop {x>-7}} \right. \; \; \Rightarrow \; \; \; -7