Rozwiąż równanie wielomianowe (jak najprostszą metodą)
(x²+2x)²-(x+1)²=55
x⁴+4x³+4x²-x²+2x+1=55
x⁴+4x³+3x²+2x+1=55
x(x³+4x²+3x+2)=54
x=54 ∨ x³+4x²+3x+2=54
x(x²+4x+3)=52
x=52 ∨ x²+4x=49
x(x+4)=49
x=49 ∨ x+4=49
x=45
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(x²+2x)²-(x+1)²=55
x⁴+4x³+4x²-x²+2x+1=55
x⁴+4x³+3x²+2x+1=55
x(x³+4x²+3x+2)=54
x=54 ∨ x³+4x²+3x+2=54
x(x²+4x+3)=52
x=52 ∨ x²+4x=49
x(x+4)=49
x=49 ∨ x+4=49
x=45