Answer:
B) f (x) = x² + 2x − 5 is quadratic function .
Step-by-step explanation:
Given : Functions .
To find : Which represents a quadratic function.
Solution : We have given functions .
Quadratic function in form of ax² + bx + c = 0 which has degree 2.
Then we can see f (x) = x² + 2x − 5 inform of quadratic function .
Where , a = 1 ,b =2 ,c = -5.
Option D also has degree 2 but its coefficient of x² is 0. so, we will not consider it.
Therefore, B) f (x) = x² + 2x − 5 is quadratic function .
