Answer:
√ 1. Quadratic
√ 2. Quadratic
√ 3. Quadratic
x 4. Not quadratic
x 5. Not quadratic
Explanation:
A quadratic function is of the form
where a, b and c are real-valued constants and a ≠ 0
b and c can be 0
The degree of a quadratic function (the highest exponent ) will be 2
#4 has has degree 1
#5 has degree 3
So only 1, 2 and 3 are quadratic functions