If the degree of cube + 2x Square-1 of polynomial ax is the same as that of 2x-3xb, what conditions should a and B satisfy

If the polynomial ax & # 179; + 2x & # 178; - 1 and 2x-3x have the same degree of power B, then:
B = 3 and a ≠ 0 [when both polynomials are cubic] or a = 0 and B = 2 [when both polynomials are quadratic]

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