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x²(x+5)-9(x+5)=0
(x²-9)(x+5)=0
(x-3)(x+3)(x+5)=0
x-3=0, x=3
x+3=0, x=-3
x+5=0, x=-5
Rozwiązaniem są x=3 lub x=-3 lub x=-5
(x^3+5x^2)+(-9x-45)=0
x^2(x+5)-9(x+5)=0
(x+5)(x^2-9)=0
x₁=-5 x²=3 x₃=-3