Question

Choose the expression that represents a quadratic expression.

Answer 1

Answer:

3) 2$x^{2}$ + 3x - 1

Step-by-step explanation:

A quadratic expression is an expression involving a squared term

It can be written as y = a$x^{2}$ + bx + c, where a ≠ 0

// note that here b and c can be equal to 0

1) 6$x^{4}$ - 5$x^{3}$  + 3$x^{2}$  - 7x - 8 is simply incorrect because you can't write in the previously mentioned form. It is a quartic function, since the unknown variable x in forth degree. It can be written as y = a$x^{4}$ +b$x^{3}$ +c$x^{2}$ + dx + e, where a before $x^{4}$ ≠ 0

2) 5$x^{3}$  + 3$x^{2}$  - 7x - 8 is simply incorrect because you can't write in the previously mentioned form. It is a cubic function, since the unknown variable x in third degree.

3) 2$x^{2}$ + 3x - 1 is correct

4) 3x - 1 is incorrect because there is no squared term. You could also say that here a = 0 and write it as y = 0 * $x^{2}$  + 3x - 1. It is also called a linear function because if you'd draw a graph, it would be a line

Answer 2

Answer:

2x2 + 3x - 1

Step-by-step explanation: