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5x⁴+5x³+x³+x²=0
5x³(x+1)+x²(x+1)=0
(5x³+x²)(x+1)=0
x²(5x+1)(x+1)=0
x=0 ∨ x= -1/5 ∨ x=-1
b)x³₊x²₋9x₋9=0
x²(x+1)-9(x+1)=0
(x²-9)(x+1)=0
(x-3)(x+3)(x+1)=0
x=3 ∨ x=-3 ∨ x=-1