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

Question

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aachen aachen · Answer 1 · 2019-01-23T05:40:07+01:00

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

wagonbelleville wagonbelleville · Answer 2 · 2019-01-23T09:17:30+01:00

Answer:

A. [tex]-3x^{2}-x+3=-3x^{2}[/tex]

Step-by-step explanation:

We know that,

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

Now, in option A, we have,

[tex]-3x^{2}-x+3=-3x^{2}[/tex] i.e. [tex]-x+3=-3x^{2}+3x^{2}[/tex] i.e. [tex]-x+3=0[/tex]

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.