Roots of Quadratic Equation - Example

Remember : Roots of a quadratic equation are the values of variables/unknowns that satisfy the equation.

Example

(a)Given x=3 is the root of the quadratic equation x 2 +2x+p=0 , find the value of p.
(b)  The roots of the quadratic equation 3 x 2 +hx+k=0   are -2 and 4. Find the value of h and k.