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2-x≤0 i 3x+7≤0 i x-√2≤0
x większe lub równe 2 i x≤3/7 i x≤√2
b) 3x³+2x²-7x+2>0
3x³+2x²-7x>-2
x(3x²+2x-7)>-2
x>-2 i 3x²+2x-7>-2
x>-2 i x(3x+2)>5
x>-2 i x>5 i 3x+2>5
x>-2 i x>5 i 3x>3
x>-2 i x>5 i x>1