Find all the zeroes of the polynomial 2x4 7x 19x2-14x + 30, if two of its zeroes are

If two of zeroes of the polynomial px=2x4+7x3 19x2 14x+30 are √2 and √2, then the other zeroes are

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Verify that the numbers given alongside of the cubic polynomials below are their zeroes. Also, verify the relationship between the zeroes and coefficients in each case:
2x3 + x2 –5x + 2; 1/2, 1,–2 

Let p(x) = 2x3+x2–5x + 2 Comparing the given polynomial with ax3 + bx3 

+ cx + d, we get
                    

Now, 
                     
                           

                          

          
                    
and   
                  
∴    are the zeroes of 
Hence, verified.Here, we have

Now,    
         
                            
and           
                                   Hence verified.