Which of the following is not a quadratic equation?

For this case we must indicate which of the equations is not quadratic.

A quadratic equation is of the form:

It is grade 2, the greatest exponent is 2.

So, we have:

Option A:

It is a quadratic equation.

Option B:

Rewritten:

It is a quadratic equation.

Option C:

It is a quadratic equation

Option D:

It can be rewritten as:

It is not grade 2, it is not a quadratic equation.

Option D

(x3 + 6x2 + 2x - 6) • (x - 1)

step-by-step explanation:

polynomial long division :

3.2     polynomial long division

dividing :   x4+5x3-4x2-8x+6

                              ("dividend")

by         :     x-1     ("divisor")

dividend     x4   +   5x3   -   4x2   -   8x   +   6

- divisor   * x3     x4   -   x3            

remainder         6x3   -   4x2   -   8x   +   6

- divisor   * 6x2         6x3   -   6x2        

remainder             2x2   -   8x   +   6

- divisor   * 2x1             2x2   -   2x    

remainder               -   6x   +   6

- divisor   * -6x0               -   6x   +   6

remainder                     0

quotient :   x3+6x2+2x-6   remainder:   0