Question

Choose the expression that represents a quadratic expression.

O 6x4 - 5x3 + 3x2 -7x - 8
) 5x3 + 3x2 -7x - 8
O 2x2 + 3x - 1
. 3x - 1

Answer 1

2x2 + 3x - 1

Explanation:

Answer 2

3) 2
`x^(2)` + 3x - 1

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