6x²-36=0x²=36x=-6 U x=67(x-2)(x+1)/(x+3)>0x=2 x=-1 x=-3 _ + _ +---------------(-3)------------(-1)---------------(2)--------------------x∈(-3;-1) U (1;∞)8(4x-9x²)/(10-x)≥0x(9x-4)/(x-10)≥0x=0 x=4/9 x=10 - + - +----------------[0]-------------[4/9]--------(10)--------------------x∈[0;4/9] U (10;∞)10x³+9x²+14x<0x(x²+9x+14)<0x(x+2)(x+7)<0x=0 x=-2 x=-7 - + _ +------------------(-7)-----------(-2)-------------(0)------------------x∈(-∞;-7) U (-2;0)