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x²-2x-4<0
delta=4+16=20
x1=2-2√5/2=2(1-√5)/2=1-√5
2)
x +2x + 3x + 4x = 1^9-1^10
10x=0
x=0
x²-2x-4<0
a=1 b=-2 c=-4
delta=-2^2+(-4)*(-4)= 4+16 = 20
pierwiastek z delty= 2pierwiastki z 5
x1=2-2pierwiastki z5/2=2(1-pierwiastek z5)/2=1-pierwiastek z 5
x2=2+2pierwiastki z5/2=2(1+pierwiastek z5/2=1+pierwiastek z 5
2)x +2x + 3x + 4x = 1^9-1^10
10x=0
x=0