Identify coefficients: Identify the coefficients a, b, and c from the quadratic equation in the form ax2+bx+c=0. For the equation z2+6z+9=0, we have: a=1 (coefficient of z2) b=6 (coefficient of z) c=9 (constant term)
Calculate discriminant: Use the discriminant formula D=b2−4ac to calculate the discriminant of the quadratic equation.Substitute the identified values into the formula:D=(6)2−4×1×9
Find value: Perform the calculations to find the value of the discriminant.D=36−4×1×9D=36−36D=0