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Podstawiam wspolrzedne A i miejsce zerowe.
64a+8b=0 /:8
16a+4b=-4 /:(-4)
8a+b=0
-4a-b=1
---------------- +
4a=1
a=1/4
8*1/4+b=0
2+b=0
b=-2
a)
W(x)=1/4x⁴-2x²
b)
1/4x⁴-2x²=-3 /*4
x⁴-8x²+12=0
x⁴-2x²-6x²+12=0
x²(x²-2)-6(x²-2)=0
(x²-2)(x²-6)=0
(x+√2)(x-√2)(x+√6)(x-√6)=0
Odp. x∈{-√6, -√2, √2, √6}