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b)2x²(-2x²+13x-6)
c)2x³+6x+5x²+15
2x(x²+3)+5(x²+3)
(2x+5) ( x²+3)
(2x+5) (x-pierwiastek z 3) (x+ pierwiastek z 3)
5(x^4-4)
5(x^2-2)(x^2+2)
5(x-√2)(x+√2)(x^2+2)
b) -4x⁴+26x³-12x²
-x^2 (4x^2-26x+12)
∆=26^2-4*4*12=676-192=484
√∆=22
x_1=(26+22)/8=6
x_2=(26-22)/8=4/8=0,5
-x^2 (x-6)(x-0,5)
c)2x³+5x²+6x+15
2x(x^2+3)+5(x^2+3)
(2x+5)(x^2+3)
(x+2,5)(x^2+3)