Question 1026249
If you found this example,  {{{y=(x+6)(x^2+5)}}}, you would understand that this has only a single real zero, while the other TWO zeros are not real.  The degree of the equation, if as a function, is odd, specifically here, being 3.  NOT even, but odd.  Could you imagine any such {{{y=(x-a)(x^2+b)}}} for which the root x-a would be not Real?  Assuming a and b are Real...