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√∆=6
x1=(-6-6)/2√2=-12/2√2=-6/√2*√2/√2=-6√2/2=-3√2
b)∆=3-0
∆=3
√∆=√3
x1=-√3-√3/2√6=-2√3/2√6=-√3/√6*√6/√6=-3√2/6= - 1/3√2
c)-x²-1≤0
∆=0+4
∆=4
√∆=2
x1=0+2/-2=-1
d)-x²-x+2>0
∆=1+8
∆=9
√∆=3
x1=1-3/-2=-2/-2=1