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Select all of the following that are quadratic equations.



7x2 + 14x = 0
x3 - 3x2 + 1 = 0
5x - 7 = 0
x2 + 3x -5 = 0
x - 5 = 9x + 7
x2 - x = 3x + 7

Respuesta :

texaschic101
a quadratic equation has to have x^2....it does not necessarily have to have a constant.

7x^2 + 14x = 0
x^2 + 3x - 5 = 0
x^2 - x = 3x + 7
these are quadratic

Answer:

The quadratic equations are [tex]7x^2 + 14x = 0[/tex], [tex]x^2 + 3x -5 = 0[/tex]  and [tex]x^2 - x = 3x + 7[/tex].

Step-by-step explanation:

Consider the provided information.

We need to find all the quadratic equations.

The given equations are:

[tex]7x^2 + 14x = 0[/tex]

[tex]x^3 - 3x^2 + 1 = 0[/tex]

[tex]5x - 7 = 0[/tex]

[tex]x^2 + 3x -5 = 0[/tex]

[tex]x - 5 = 9x + 7[/tex]

[tex]x^2 - x = 3x + 7[/tex]

Quadratic equations is an equation of the second degree (degree is the highest power of x).

Now consider the provided options:

The equations having second degree are:

[tex]7x^2 + 14x = 0[/tex] The highest power of x is 2.

[tex]x^2 + 3x -5 = 0[/tex] The highest power of x is 2.

[tex]x^2 - x = 3x + 7[/tex] The highest power of x is 2.

Hence, the quadratic equations are [tex]7x^2 + 14x = 0[/tex], [tex]x^2 + 3x -5 = 0[/tex]  and [tex]x^2 - x = 3x + 7[/tex].

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