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x⁴+8x²-9=0
x²=z
z²+8z-9=0
Δ=b²-4ac=64+36=100
√Δ=10
z₁=(-b-√Δ):2a=(-8-10):2=-9 odpada bo z=x² i nie może byż ujemne
z₂=(-8+10):2=1
z=x²
1=x²
x=√1
x₁=1
x₂=-1