Identify values: Identify the values of a, b, and c by comparing the given equation z2+4z+4=0 with the standard form of a quadratic equationax2+bx+c=0. Here, a=1, b=4, and c=4.
Recall formula: Recall the formula for the discriminant of a quadratic equation, which is D=b2−4ac.
Substitute values: Substitute the identified values of a, b, and c into the discriminant formula.So, D=(4)2−4×1×4.
Perform calculations: Perform the calculations to find the value of the discriminant.D=16−4×1×4D=16−16D=0