-+12x-350
Х²+12х-35≤0 х²+12х-35=0 Д=144+4*35=144+140=284 х₁=-12-√284 = -12 -2√71 = -6 -√71 2 2 х₂=-6 + √71 + - + -------- -6-√71 ------------ -6 +√71 -------------- \\\\\\\\\\\\\\\\\ х∈[-6-√71; -6+√71]