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W(2)=8-8m+4n
W(-2)=16+8m+4n-8
W(-2)=8+8m+4n
8-8m+4n= 8+8m+4n
m=0
W(3)=82
81-27m+9n-8=82
9n=9
n=1
x⁴+x²-8>x⁴+2
x²-10>0
(x-√10)(x+√10)>0
x₁=-√10
x₂=√10
x∈(-nieskończoności,-√10)i(√10,+nieskończoność)