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5/4x⁴+√2 x³ -1/8x²-1/4 x⁴+2√2 x³- 3/8 x²=
x⁴+3√2 x³ - 4/8x² =x ⁴ +3√ 2 x³ -1/2 x²
dla x=-√2
= (-√2)⁴ +3√2 *(-√2)³-1/2*(-√2)²= 4-12-1=-9