Polynomials exercise 2.2 .Find the zeroes of 6x^2-3-7x , 4u^2+8u t^2-15, 3x^2-x-4

Find the zeroes of the following quadratic polynomials and verify the relationship between the zeroes and coefficient. 6x^2-3-7x, 4u^2+8u, t^2-15, 3x^2-x-4