Identify values: Identify the values of a, b, and c by comparing the given equation x2+4x−2=0 with the standard quadratic equation form ax2+bx+c=0. Here, a=1, b=4, and c=−2.
Use discriminant formula: Use the discriminant formula D=b2−4ac to find the discriminant of the quadratic equation.Substitute 1 for a, 4 for b, and −2 for c in the formula.D=(4)2−4×1×(−2)
Calculate discriminant: Calculate the discriminant.D=16−4×1×(−2)D=16+8D=24