1.10.26 Polynomials
Condition: Find \[ \text { GCD }\left(x^{6}-7 x^{4}+8 x^{3}-7 x+7.3 x^{5}-7 x^{3}+3 x^{2}-7\right) \text {. } \]
Polynomials and their complex, real and rational roots. Decomposition in various numerical fields.