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13x=48/:13
x= 3,69
x⁴-6x³+8x=0-48
-6x do 8 potegi=-48+8
-6x do 8 potegi=-40
x³(x-6)+8(x-6)=0
(x-6)(x³+8)=0
z tego wynika, że
x-6=0 lub x³+8=0
x=6 lub x=∛8
x=6 lub x=2
x∈{2,6}
Pozdrawiam.