Question

Which of the following is the discriminant of the polynomial below?x² + 4x+5A. 4B. -16C. -4O oD. 5

Answer 1

we know that

the discriminant of the quadratic equation is equal to

`D=b^2-4ac`

In this problem we have

x^2+4x+5

so

a=1

b=4

c=5

substitute

`\begin{gathered} D=4^2-4(1)(5) \\ D=16-20 \\ D=-4 \end{gathered}`

answer is option C