1. find a quadratic polynomial the sum of the zeroes is 0 and one zero is 5.
2. find a cubic polynomial with sum, sum of product taken two at a time and product as 5,-6,-20 respectively.
3. find a quadratic polynomial whose one zero is -5 and product of zero is 0.
4. if one zero of the quadratic polynomial 4x2-8kx-9 is negative of the other find "k".
5. if one zero of the polynomial x2-6x+k is double the other find k

can u pls explain pls pls pls