rozwiąż równania: a)5x^3+x^2-15x-3=0 b)x^4+x^3-4x^2-4x-3=0 c)81x^3-8x^2-9x+1=0 d)x^3+3x=0 e)4x^5-x^3=0 f)7x^4-28x^2=0 g)2x^2-16x=0
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a)5x3+ x2 -15x - 3 =0
x2(5x+1)-3(5x+1)=0
(5x+1)* (x2-3)=0
5x+1=0 v x2-3=0
5x=-1 v x2=3
x=-1/5 v x=√3 v x= -√3
b)4x3-x2-16+4=0
x2(4x-1)(4x-1)=0
(4x-1)(x2-4)=0
(4x-1)(x-2)(x+2)=0
rozwiazanie:. x=1/4 lub x=2 lub x=-2