Question

Select all of the following that are quadratic equations.

x^2 - 2x = 4x + 1
x^3 - 6x2 + 8 = 0
5x - 3 = 0
2x^2+ 12x = 0
5x - 1 = 3x + 8
9x^2 + 6x - 3 = 0

Answer 1

quadratic equations have the second degree at most but should have second degrees: they are of the from ax^2+bx+c=0 so 1,3 and 6 are quadratics, the others are not since 2 has a third degree, while 3 and 5 does not have any second degree

Answer 2

Awesome, thank you