Question

Select all of the following that are quadratic equations.

3 x^2 + 5 x - 7 = 0
x^3 - 2 x^2 + 1 = 0
2 x - 1 = 0
5 x^2 + 15 x = 0
6 x - 1 = 4 x + 7
x^2 - 4 x = 4 x + 7

Answer 1

These are the quadratic equations

x^2 - 4 x = 4 x + 7

x^2 - 4 x = 4 x + 7

x^3 - 2 x^2 + 1 = 0

3 x^2 + 5 x - 7 = 0

Explanation:

Equations that follow this formula ( ax^2+ bx+ c= 0 ) are considered as quadratic equations