Question

Select all of the following that are quadratic equations. x3 - 4x2 + 3 = 0 x - 9 = 0 3x2 + 12x = 0 x2 + 9x -7 = 0 x2 - x = 8x + 2 x - 2 = 3x + 9

Answer 1

The quadratic equations:

$3x^2+12x=0\\\\x^2+9x-7=0\\\\x^2-x=8x+2$

The cubic equation: $x^3-4x^2+3=0$

The linear equations:

$x-9=0\\x-2=3x+9$