Question

Which of the following cannot be solved using the quadratic formula?

Answer 1

Answer:

Option A is correct, i.e. -3x² -x +3 = -3x²

Step-by-step explanation:

We can rearrange the terms, and combine like terms to get each equation in standard form of quadratic equation like ax²+bx+c=0.

It must have degree 2 to be solved using quadratic formula.

Option A: -3x² -x +3 = -3x²

Rearranging the terms:-

3x² -3x² -x +3 = 0

Combining like terms:-

0 -x +3 = 0

-x +3 = 0

This is linear equation with degree 1 and can be solved without quadratic formula.

Hence, option A is correct, i.e. -3x² -x +3 = -3x²

Answer 2

Answer:

A. $-3x^{2}-x+3=-3x^{2}$

Step-by-step explanation:

We know that,

The quadratic formula is used to find the solution of a quadratic equation $ax^{2}+bx+c=0$ i.e. an equation of degree 2.

Now, in option A, we have,

$-3x^{2}-x+3=-3x^{2}$ i.e. $-x+3=-3x^{2}+3x^{2}$ i.e. $-x+3=0$

So, the final equation is not a quadratic equation but it is a linear equation.

Hence, for this equation, we cannot use the quadratic formula.